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    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction contains answers to the exercise wise questions drafted by the subject experts in a systematic manner to help students face the CBSE Term I exams without fear. Visit here to get the 2021-22 solutions for free.

    NCERT SolutionsNCERT Solutions for Class 10NCERT Class 10 ScienceChapter 10 Light Reflection And Refraction

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    NCERT Solutions for Class 10 Science Chapter 10: Light Reflection and Refraction

    NCERT Solutions for Class 10 Science Chapter 10: Light Reflection and Refraction NCERT Solutions Class 10 Science Chapter 10 – CBSE Term I Free PDF Download

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction is structured in a way to present a comprehensible coverage of scientific topics related to our daily life. Basic science has been laid out to students with no sharp divisions in disciplines such as Physics, Chemistry and Biology. NCERT is accepted and recommended throughout the schools in the nation. Following are a few reasons to rely on NCERT Solutions:

    The tricky questions inserted between chapters force students to think out of the box and apply the concepts learned in the chapter.

    NCERT Solutions provide you with detailed solutions to the chapter questions that help you fetch marks in the CBSE Term I exams.

    NCERT Solutions are popular among students, especially for Science and Mathematics. NCERT Solutions for Class 10 Science Chapter 10 – Light Reflection and Refraction provided here consist of well-explained solutions to all the questions asked in the textbook. Get your hands on the comprehensive NCERT Solutions for Chapter 10 Light Reflection and Refraction here, for free!

    Chapter 10 Light Reflection and Refra..

    Download PDF of NCERT Solutions for Class 10 Science Chapter 10: Light Reflection and Refraction

    Access Chapter wise NCERT Solutions for Class 10 Science – Light Reflection and Refraction

    Questions Page: 168

    1. Define the principal focus of a concave mirror.Answer-

    Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is called the principal focus of the concave mirror.

    2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?Answer-

    Radius of curvature (R) = 20 cm

    Radius of curvature of the spherical mirror = 2 × Focal length (f)

    R = 2f

    f= R/2 = 20 / 2 = 10

    Therefore, the focal length of the spherical mirror is 10 cm.

    3. Name the mirror that can give an erect and enlarged image of an object.Answer-

    The mirror that can give an erect and enlarged image of an object is Concave Mirror.

    4. Why do we prefer a convex mirror as a rear-view mirror in vehicles?Answer-

    Convex mirror is preferred as a rear-view mirror in cars and vehicles as it gives a wider field of view, which helps the driver to see most of the traffic behind him. Convex mirrors always form an erect, virtual, and diminished image of the objects placed in front of it.

    Page No: 171

    1. Find the focal length of a convex mirror whose radius of curvature is 32 cm.Answer-

    Radius of curvature (R) = 32 cm

    Radius of curvature = 2 × Focal length (f)

    R= 2f f = R/2 = 32/2 = 16

    Therefore, the focal length of the given convex mirror is 16 cm.

    2. A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?Answer-

    Magnification produced by a spherical mirror:

    Object distance (u) = – 10 cm

    v = 3 × (- 10) = – 30 cm

    Therefore, the negative sign indicates that an inverted image is formed in front of the given concave mirror at a distance of 30 cm.

    Page No: 176

    1. A ray of light travelling in air enters obliquely into water. Does the light ray bends towards the normal or away from the normal? Why?Answer-

    The light ray bends towards the normal. When a light ray enters from an optically rarer medium (which has low refractive index) to an optically denser medium (which has a high refractive index), its speed slows down and bends towards the normal. As water is optically denser than air, a ray of light entering from air into water will bend towards the normal.

    2. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 ms-1.Answer-

    Refractive index of a medium (nm) = Speed of light in vacuum/Speed of light in the medium

    Speed of light in vacuum (c) = 3 × 108 m/s

    Refractive index of glass (ng) = 1.50

    Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass

    = c/ng

    =3 × 108/1.50 = 2x 108 ms-1.

    3. Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.MaterialmediumRefractive index Material medium RefractiveindexAir 1.0003 Canada Balsam 1.53

    स्रोत : byjus.com

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction Solved by Expert Teachers at LearnCBSE.in from Latest Edition NCERT Books.

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    September 27, 2019 by Veerendra

    NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction: In this article, you candidates can find light reflection and refraction class 10 NCERT solutions. Working on the light chapter of class 10 NCERT solutions will help candidates to build a strong foundation over the subject Physics. Knowing light reflection and refraction class 10 questions and answers will help students of class 10 to bag a decent score in class 10 board exams as well.

    Along with NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction candidates can also find light reflection and refraction class 10 numericals questions in this article. Go through them will help candidates get a clear idea about how to approach the problems which in turn helps you to solve them in the most efficient way. So why wait? Read on to find out everything about light reflection and refraction class 10 important questions with answers here.

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    Before getting into the details of NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction, let’s have an overview of topics and subtopics under NCERT class 10 science book activities solutions chapter 10:

    Light – Reflection And Refraction

    Reflection Of Light Spherical Mirrors Refraction Of Light

    Free download NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction PDF in Hindi Medium as well as in English Medium for CBSE, Uttarakhand, Bihar, MP Board, Gujarat Board, and UP Board students, who are using NCERT Books based on updated CBSE Syllabus for the session 2019-20.

    प्रकाश-परावर्तन एवं अपवर्तन कक्षा 10 विज्ञान हिंदी में

    Class 10 Light Reflection and Refraction Important Questions

    Light Reflection and Refraction Class 10 Notes

    Light Reflection and Refraction NCERT Exemplar Solutions

    Class 10 Science Light Reflection and Refraction Mind Map

    NCERT Solutions for Class 10 Science Chapter 10 Intext Questions

    Page Number: 168

    Question 1

    Define the principal focus of a concave mirror.

    Answer:

    The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from the concave mirror.

    Question 2

    The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

    Answer: Focal length = 1 2

    x Radius of curvature =

    1 2 x 20 cm = 10 cm Question 3

    Name a mirror that can give an erect and enlarged image of an object.

    Answer: Concave mirror. Question 4

    Why do we prefer a convex mirror as a rear-view mirror in vehicles ?

    Answer:

    We prefer a convex mirror as a rear-view mirror in vehicles because of two reasons :

    A convex mirror always produces an erect image of the objects.

    The image formed in a convex mirror is highly diminished or much smaller than the object, due to which a convex mirror gives a wide field of view of the traffic behind. A convex mirror enables the driver to view such larger area of the traffic behind him.

    Page Number: 171

    Question 1

    Find the focal length of a convex mirror whose radius of curvature is 32 cm.

    Solution: R = +32 cm and f= R 2 =+ 32 2 =+16cm Question 2

    A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located ?

    Solution:

    Because the image is real, so magnification m must be negative.

    Thus the image is located at a distance of 30 cm from the mirror on the object side of the mirror.

    Page Number: 176

    Question 1

    A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal ? Why ?

    Answer:

    The light-ray bends towards the normal because the ray of light goes from a rarer medium to a denser medium.

    Question 2

    Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass ? The speed of light in vacuum is 3 x 108 ms-1.

    Solution:

    Refractive index of glass, n8 = 1.50

    Question 3

    Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.

    Answer:

    From table 10.3, diamond has highest refractive index (= 2.42), so it has highest optical density.

    Air has lowest refractive index (= 1.0003),

    so it has lowest optical density.

    Question 4

    You are given kerosene, turpentine and water. In which of these does the light travel fastest ? Use the information given in Table 10.3.

    Answer:

    For kerosene, n = 1.44

    For turpentine, n = 1.47

    For water, n = 1.33

    Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.

    स्रोत : www.learncbse.in

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    10 May, 2021

    NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction

    In this page we have provided NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction through which you can complete your homework on time and increase concentration as well. These Chapter 10 NCERT questions and answers of Class 10 Science will help you in analyzing the problems and answering it with precision and the right concepts.

    In this chapter, we will learn about variety of topics like  laws of reflection, propagation of light, plane mirror, spherical mirror, mirror formula, laws of refraction and spherical lenses which will widen your perspective of knowledge. You can figure out the latest marking scheme and prepare your answers as per the demand with the help of these Class 10 NCERT Solutions.

    Study Reference for Class 10 Chapter 10 Light Reflection and Refraction

    Revision Notes for Chapter 10 Reflection and RefractionExtra Questions for Chapter 10 Light Reflection and Refraction Class 10 ScienceMCQ Questions for Chapter 10 Light Reflection and Refraction Class 10 ScienceIn Text Questions

    Page No: 168

    1. Define the principal focus of a concave mirror.

    Answer

    Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

    2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

    Answer

    Radius of curvature, = 20 cm

    Radius of curvature of a spherical mirror = 2 × Focal length ()= 2

    = /2 = 20 / 2 = 10

    Hence, the focal length of the given spherical mirror is 10 cm.

    3. Name the mirror that can give an erect and enlarged image of an object.

    ► Concave Mirror.

    4. Why do we prefer a convex mirror as a rear-view mirror in vehicles?

    Answer

    We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which allows the driver to see most of the traffic behind him. Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it.

    Page No: 171

    1. Find the focal length of a convex mirror whose radius of curvature is 32 cm.

    Answer

    Radius of curvature, = 32 cm

    Radius of curvature = 2 × Focal length ()

    = 2/2 = 32/2 = 16

    Hence, the focal length of the given convex mirror is 16 cm.

    2. A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Where is the image located?

    Answer

    Magnification produced by a spherical mirror is given by the relation,

    Object distance, = - 10 cm

    = 3 × ( - 10) = - 30 cm

    Here, the negative sign indicates that an inverted image is formed at a distance of

    30 cm in front of the given concave mirror.

    Page No: 176

    1. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

    Answer

    The ray of light bends towards the normal. When a ray of light enters from an optically rarer medium (having low refractive index) to an optically denser medium (having high refractive index), its speed slows down and it bends towards the normal. Since water is optically denser than air, a ray of light entering from air into water will bend towards the normal.

    2. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 ms-1.

    Answer

    Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium

    Speed of light in vacuum, c = 3 × 108 ms-1

    Refractive index of glass, ng = 1.50

    Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass

    = c/ng

    =3 × 108/1.50 = 2x 108 ms-1.

    3. Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.

    MaterialmediumRefractive indexMaterial mediumRefractiveindex

    Air 1.0003 Canada Balsam 1.53 Ice 1.31 - - Water 1.33 Rock salt 1.54 Alcohol 1.36 - - Kerosene 1.44 Carbon disulphide 1.63 Fused quartz 1.46 Dense flint glass 1.65 Turpentine oil 1.47 Ruby 1.71 Benzene 1.50 Sapphire 1.77 Crown glass 1.52 Diamond 2.42

    Answer

    Highest optical density = Diamond

    Lowest optical density = Air

    Optical density of a medium is directly related with the refractive index of that medium. A medium which has the highest refractive index will have the highest optical density and vice-versa.

    स्रोत : www.studyrankers.com

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