Question

The given figure shows the reflection of a ray of light by a plane mirror. The incident ray PQ makes an angle with the mirror is 40°. Draw the reflected ray and then find the angle between the incident ray and reflected rays .​

Answer 1

Kindly see the attachment.

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Given:

Angle of incidence=40°

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To find:

Angle of reflection

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Solution:

Here's the concept of law of reflection is used,we can find the reflected angle by applying 2nd law of reflection.

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Let's see what are laws of reflection !

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There are 2 laws of reflection.

➛ According to first law incident ray, reflected ray and normal all lie on the same plane.

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➛ The 2nd law of motion states that angle of incident will always equal to the angle of reflection .

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From 2nd law of reflection

➛ ‎ ‎ ‎Angle i =Angle r

➛ ‎ ‎ ‎40°=Angle r

∴ The required angle is 40°

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Answer 2

Answer:

Step-by-step explanation: angle of incidence = 90-40=50

angle bw reflected ray and incident ray that is angle of deviation is twice of angle i

therefore its 50×2 thats 100 degree