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    how do you appreciate the role of spherical mirrors in daily life

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    How do you appreciate the role of spherical mirrors in our daily life?

    1) Spherical mirrors are used in many ways in daily life. 2) Concave mirrors are used by dentists to see enlarged image of tooth. 3) Concave mirrors are also used in vehicles head lights. 4) Convex mirrors are used as re…

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    How do you appreciate the role of spherical mirrors in our daily life?

    CBSE Class 10

    CBSE Class 10 Science

    cbse reflectionoflight prasanna Oct '16

    Spherical mirrors are used in many ways in daily life.

    Concave mirrors are used by dentists to see enlarged image of tooth.

    Concave mirrors are also used in vehicles head lights.

    Convex mirrors are used as rear view mirrors in vehicles because convex mirror increase field of view.

    Convex mirrors are used in street light reflectors as they spread light over greater area.

    Concave mirrors are used in solar cookers.

    So there is lot of importance for spherical mirrors in our daily life. So the role of spherical, mirror would be definitely appreciated.

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    स्रोत : ask.learncbse.in

    How do you appreciate the role of spherical mirrors in daily life? (A S6)

    Q.25 of chapter 3, 3. Reflection of light by different surfaces - AP Physics book. How do you appreciate the role of spherical mirrors in daily life? (A S6)

    Book: AP Physics

    Chapter: 3. Reflection of light by different surfaces

    Subject: Physics - Class 10th

    Q. No. 25 of Improve your learning

    Listen NCERT Audio Books to boost your productivity and retention power by 2X.

    25

    How do you appreciate the role of spherical mirrors in daily life? (A S6)

    Spherical mirrors plays an important role in our day to day life. Its uses includes:

    • Concave mirrors are used in headlights of automobile, torch so that the light spreads on a wider surface thus creating wider vision.

    • Solar cookers use concave mirror as reflectors to concentrate sun rays on a point to increase the temperature of the box

    • Rear side view mirror uses convex lens to get a wider view of the road and vehicles coming behind.

    Concave mirrors are used in satellite dishes, They are used in telescopes , Dentist and ENT doctors use them to obtain a larger image than the original of the teeth , ear or skin etc . The convex mirror is suitable for convenient shop and big supermarket and any other corner where need anti-thief , It is used in the turning off the road and parking.

    More Exercise Questions

    1

    State the laws of reflection of light. (AS1)

    2

    How do you find the focal length of a concave mirror? (AS1)

    3

    Where will the image form when we place an object, on the principal axis of a concave mirror at a point between focus and center of curvature? (AS1)

    4

    Find the distance of the image when an object is placed on the principal axis at a distance of 10cm in front of a concave mirror whose radius of curvature is 8 cm. (AS1)

    5

    State the differences between convex and concave mirrors. (AS1)

    6

    Distinguish between real and virtual images. (AS1)

    7

    How do you get a virtual image using a concave mirror? (AS1)

    8

    What do you know about the terms given below related to spherical mirrors? (AS1)

    a) Pole: b) Centre of curvature:

    c) Focus: d) Radius of curvature:

    e) Focal length: f) Principle axis:

    g) Object distance: h) Image distance:

    i) Magnification: 9

    Write the rules for sign convention. (AS1)

    10

    The magnification produced by a plane mirror is +1. What does this mean? (AS1)

    11

    Imagine that spherical mirrors were not known to human beings. Guess the consequences. (A52)

    12

    By observing steel vessels and different images in them; Surya, a third-class student, asked his elder sister Vidya some questions. What may be those questions? (AS2)

    13

    How do you verify the 1st law of reflection of light with an experiment? (AS3)

    14

    How do you verify the 2nd law of reflection of light with an experiment? (AS3)

    15

    What do you infer from the experiment which you did with concave mirrors and measured the distance of object and distance of image? (A53)

    16

    Find the plane of the reflection experimentally for the incident ray which passes through the heads of the pins pierced in front of the mirror. (AS3)

    17

    Collect information about the history of spherical mirrors in human civilization. Display it in your class room. (AS4)

    18

    Think about the objects which act as a concave or convex mirrors in your surroundings. Make a table and display it in your class room. (AS4)

    19

    How will our image be in concave and convex mirrors? Collect photographs and display in your class room. (AS4)

    20

    Draw and explain the process of formation of image with a pinhole camera'?

    21

    Draw suitable rays by which we can guess the position of the image formed by a concave mirror. (AS5)

    22

    Show the formation image with a ray diagram when an object is placed on the principal axis of a concave mirror away from the center of curvature. (AS5)

    23

    Make a solar heater/cooker and explain the process of making. (AS5)

    24

    To form the image on the object itself, how should we place the object in front of a concave mirror? Explain with a ray diagram. (AS5)

    25

    How do you appreciate the role of spherical mirrors in daily life? (A S6)

    26

    How do you appreciate the use of reflection of light by a concave mirror in making of TV antenna dishes? (AS6)

    27

    Have you ever observed the image of the sky in rain water pools on earth? Explain the reflection of light in this context. (AS6)

    28

    Discuss the merits and demerits of using mirrors in building elevation. (AS7)

    29

    Why do we prefer a convex mirror as a rear-view mirror in the vehicles? (AS7)

    30

    A convex mirror with a radius of curvature of 3m is tried as rear view in an automobile. If a bus is located at 5m from this mirror, find the position, nature and size of the image. (AS7)

    31

    An object is placed at a distance of 10cm from a convex mirror of focal length 15cm. Find the position and nature of the image. (AS7)

    स्रोत : philoid.com

    How do you appreciate the role of spherical mirrors in daily life

    The spherical mirrors play an important role in each step of human life Spherical mirrors like convex mirrorsare used as rearview mirrors for vehicles enabling them to see the view behind the driver It also provides the driver with a wider field view Whereas concave mirrors are used in torches headlights etc to get a powerful beam of parallel light rays They are also used as shaving mirrors andused by the doctors to see the enlarged image as they provide a virtual erect image when placedcloser to focusThey are alsoused to concentrate sunlight to produce heat in solar furnaces In this way the use of spherical mirrors have wide applications and the discovery of these mirrors are well appreciated as no daily work couldnt have been possible without this

    Physical Science Class 9>Reflection of Light at Curved Surfaces>Improve your learning>Q 21

    EASY Earn 100

    How do you appreciate the role of spherical mirrors in daily life?

    The spherical mirrors play an important role in each step of human life. Spherical mirrors, like convex mirrors, are used as rearview mirrors for vehicles enabling them to see the view behind the driver. It also provides the driver with a wider field view. Whereas concave mirrors are used in torches, headlights, etc to get a powerful beam of parallel light rays. They are also used as shaving mirrors and used by the doctors to see the enlarged image, as they provide a , erect image when placed closer to focus. They are also used to concentrate sunlight to produce heat in solar furnaces. In this way, the use of spherical mirrors have wide applications and the discovery of these mirrors are well appreciated as no daily work couldn't have been possible without this.

    Important Questions on Reflection of Light at Curved Surfaces

    EASY

    Physical Science Class 9>Reflection of Light at Curved Surfaces>Improve your learning>Q 22

    How do doctors use concave mirrors?

    EASY

    Physical Science Class 9>Reflection of Light at Curved Surfaces>Improve your learning>Q 23

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

    EASY

    Physical Science Class 9>Reflection of Light at Curved Surfaces>TRY THESE>Q 4

    How will our image be in concave and convex mirrors?

    Important Points to Remember on Reflection of Light at Curved Surfaces

    1. Spherical mirror:

    (i) If the inner surface of the spherical mirror is the reflecting surface, then it is called a concave mirror.

    (ii) If the outer surface of the spherical mirror is the reflecting surface then it is called a convex mirror.

    (iii) The centre of the reflecting surface of the mirror is called its pole.

    (iv) The centre of the sphere of which the mirror is a part, is called the centre of curvature of the mirror.

    (v) The radius of the sphere of which the mirror is a part, is called the radius of curvature of the mirror.

    (vi) The straight line passing through the pole and centre of curvature of the mirror is called its principal axis.

    2. Principal Focus:

    (i) Incident rays which are parallel to the principal axis of a concave mirror, after reflection from the mirror, meet at a particular point in front of the mirror on the principal axis. This point

    F

    is called the principal focus of the concave mirror.

    (ii) In the case of a convex mirror, incident rays parallel to the principal axis, after reflection, appear to come from a particular point behind the mirror lying along the principal axis. This point is called the principal focus of the convex mirror.

    (iii) The distance f

    between the pole and the principal focus of the mirror is called the focal length. This distance is half of the radius of curvature of the mirror.

    3. Rules to draw a ray diagram:Rule

    1

    : If an incident ray is parallel to the principal axis then the reflected ray passes through the principal focus.

    Rule

    2

    : If an incident ray passes through the principal focus of the mirror, the reflected ray is parallel to the principal axis.

    Rule

    3

    : If an incident ray passes through the centre of curvature of the mirror, the reflected ray traces the same path back.

    4. Image formed by Convex mirror:

    The nature of the image formed by a convex mirror does not depend on the distance of the object from the mirror. These images are always virtual, smaller than the object and situated behind the mirror.

    5. New Cartesian Sign Conventions:

    According to the Cartesian sign convention, the pole of the mirror is taken as the origin. The principal axis is taken as the

    X

    -axis of the frame of reference. The sign conventions are as follows.

    (i) The object is always kept on the left of the mirror. All distances parallel to the principal axis are measured from the pole of the mirror.

    (ii) All distances measured towards the right of the pole are taken to be positive, while those measured towards the left are taken to be negative.

    (iii) Distances measured vertically upwards from the principal axis are taken to be positive.

    (iv) Distances measured vertically downwards from the principal axis are taken to be negative.

    (v) The focal length of a concave mirror is negative while that of a convex mirror is positive.

    6. Mirror Formula and Magnification:

    (i) Mirror formula: 1u+1v=1f , where u and v

    are object and image distances respectively, and

    f

    is the focal length of the mirror.

    f

    is half the radius of curvature

    R . f

    is negative for concave mirror;

    f

    is positive for a convex mirror.

    (ii) The magnification produced by a spherical mirror is given by,

    m=-vu

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