# what is the angle of incidence of a ray if the reflected ray is at an angle of 90 to incident ray

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## Q.13 What Is The Angle Of Incidence Of A Ray

Get detailed answer of q.13 what is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

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## Q.13 What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Answer :

If the reflected ray is at the angle of 90 degrees to the incident ray, then the angle of incidence is 45 degrees.

According to the law of reflection, the angle of incidence is equal to the angle of reflection.

Therefore, the angle of incidence and the angle of reflection both are equal to

90/2 = 45 degrees.

## NCERT solutions of related questions for Light

Q.1 Suppose you are in a dark room. Can you see objects in the room? Can you see objects out¬side the room ?

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Q.3 Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. (a) Polished wooden table (b) Chalk powder (c) Cardboard surface (d) Marble floor with water spread over it (e) Mirror (f) Piece of paper

Q.4 State the laws of reflection.

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Q.6 Fill in the blanks in the following. (a) A person 1 m in front of a plane mirror seems to be ______ m away from his image. (b) If you touch your ______ ear with a right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with _____ (c) The size of the pupil becomes _______ when you see in dim light. (d) Night birds have _______ cones than rods in their eyes.

Q.7 The angle of incidence is equal to the angle of reflection (a) Always (b) Sometimes (c) Under special conditions (d) Never

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Q.12 Explain how you can take care of your eyes.

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## What is the angle of incidence of a ray if the reflected ray if the reflected ray is at an angle of 90 degree to the incident ray? Answer is 45 degree. But my physics teacher tells that answer in 90 degree . Please explain.

What is the angle of incidence of a ray if the reflected ray if the reflected ray is at an angle of 90 degree to the incident ray? Answer is 45 degree. But my physics teacher tells that answer in 90 degree . Please explain.

Byju's Answer Standard VIII Physics Laws of Reflection What is the a... Question

What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?

Open in App Solution

We know that the angle of incidence is equal to the angle of reflection.

∠i = angle of incident.

∠r = angle of reflection.

Given: ∠i + ∠r = 90°

Since ∠i = ∠r hence;

∠i + ∠i = 90° Or, 2∠i = 90° Or, ∠ i= 45°.

Thus, the angle of incidence is 45°.

Suggest Corrections 56 SIMILAR QUESTIONS

**Q.**

What is the angle of incidence of a ray of light if the reflected ray is at an angle of

90 ∘

to the incidence ray?

**Q.**

What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?

**Q.**A ray incident on a plane mirror is reflected in a direction such that the angle between the incident and the reflected ray is 90 degree. What are the angles of incidence and reflection?

**Q.**

In which direction will a light falling along the normal to a mirror be reflected

Could you please check my answer

Ans: as the incident ray is zero degree the reflected ray will also be reflected at the same angle which is at zero degree along the normal

**Q.**A ray of light from a denser medium strikes a rare medium at angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90°with each other. The angles of reflection and refraction are r and r'. The critical angle between them is

(a) sin^-1(tanr) (b) sin^-1(tani) (c) sin^-1(tanr') (d) tan^-1(tani)

(The figure has an incident ray , a reflected ray , a normal and a refracted ray all lying at the point of incidence and an angle of 90 degree btw reflected and refracted ray)

*(Sir/madam please send a detailed answer along with the explanation of the QUESTION)

View More

## What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Answer (1 of 3): By the Laws of Reflection, angle of incidence i = angle of reflection r. Since the reflected ray(angle of reflection r) and the the incident ray(angle of incidence i) are at 90 degrees to each other, angle of reflection r = angle of incidence i = (90/2) = 45 degrees.

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

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Sort Nand Kishor Mandal

A Government Teacher, Now. (1998–present)Author has 206 answers and 140.2K answer views2y

Here,the angle formed by reflected ray with the incidence ray =90°

So,the angle of incidence(i)=?

A/q

I+r=90°. [According to the laws of the reflection of light i=r]

=>i +I = 90° =>2i =90° =>i =90°/2 =>I =45°

Hence,the angle of incidence=45° ,And.

Note-If it is helpful for you upvote and follow me for more answers.

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The angle between a reflected ray and incident ray is 60. What is the value of the angle of incident?

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What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?

By the Laws of Reflection, angle of incidence i = angle of reflection r. Since the reflected ray(angle of reflection r) and the the incident ray(angle of incidence i) are at 90 degrees to each other, angle of reflection r = angle of incidence i = (90/2) = 45 degrees.

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Lee Stewart

PhD from University of Cincinnati (PhD) (Graduated 1975)Author has 203 answers and 29.9K answer viewsSep 1

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If the incident ray and reflected ray have equal angles, what will be the value for the angle of incidence and reflection?

Angles of incidence and reflection are measured relative to a normal to the reflection surface, i.e., relative to a line perpendicular to the reflection surface. This means that the incident and reflected angles share the normal. The angle of reflection is always equal to the angle of incidence. If the angle of incidence is

θ θ

, then the angle formed between incidence and reflection is

2θ 2θ .

Alexander E. Hillaris

Hellenic Navy Commodore (Retired), PhysicistAuthor has 154 answers and 86K answer views4y

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Normally, if the incidence angle is 45 theen the reflection angle is bound to be 45, both angles measured from the mirror surface. Now the angle between insident and reflected ray will be 45+45=90.

I hope it helps, yet I suggest the use of a plot for clarification.

Nrl Swamy

AA at Kotak Life Insurance3y

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The angle between incident ray and reflected ray is 60. What is the angle of incidence?

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Paul Manhart

Studied at Optical Sciences Center. University of Arizona. Physics and Astronomy, Univ of Arizona.Author has 4.7K answers and 1.5M answer viewsNov 6

Related

What is the angle of an incident ray if the reflected ray and the refracted ray form a 90 degree angle?

For refraction, Snell’s law stated that

n sin(theta) = n’ sin(theta’).

For reflection, we know the angle of incidence (theta) is equal to the angle of reflection.

So if the refracted and reflected rays form a 90 degree angle, then we know that

theta + theta’ = 90 deg.

So you have two equations.

theta’ = 90 - theta

sin(theta) = n sin(90 - theta). Assuming the first medium is air.

We know that sin(a-b) = sin(a) cos(b) - cos(a) sin(b).

sin(90) = 1 and cos(90) = 0, so

sin(90 - theta) = sin(90) cos(theta) - cos(90) sin(theta). This means that sin(90-theta) = cos(theta).

So you have

sin(theta) = n’ cos(theta).

n Jainam Shah

Author has 56 answers and 377.7K answer views3y

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The angle between the incident ray and reflected ray in 110 so what will be the angle of reflection?

Assuming the ray hits an ideal surface, the angle of incidence will be equal to the angle of reflection, as they are both adjacent to a line perpendicular to the surface (normal line), or otherwise:

θ incidence = θ reflection

θincidence=θreflection

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