Question

Holla Brainliacs'

Do Question number 15 in the attachment ⤴️

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Answer 1

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The first law of reflection is used to obtain the path of reflected light.

It can be observed that the given ray of light will reflect from the second mirror at an angle 60°.
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$\huge\bold {hope \: its \: helpful}$_

Answer 2

$\underline{\textbf{The Laws of Reflection:}}$

1. The angle of incidence is always equal to the angle of reflection .

2 . The incident ray , reflected ray and normal , drawn at the point of incidence , all lie on the same plane .

★ Angle of incidence : The angle between the normal and the incident ray is called angle of incidence .

★ Angle of reflection : The angle between the normal and the reflected ray is called the angle of reflection .

★ Normal : An imaginary perpendicular line drawn at the point of incidence .

$\underline{\huge\text{Answer:}}$

According to the question , the two mirrors meet at right angles . One incident ray stikes the first mirror at an incline of 30°.

We need to find the angle between the reflected ray and the plane of the second mirror, i.e , the angle of reflection .

As we know from the first law of reflection , we have :-

Angle of Incidence = Angle of Reflection .

=> 30° = 30°

Let us draw the normals from both the mirrors . We can see that both the normals intersect each other at a point , at right angle . Here we can get the angle of incidence for the second mirror as :-

180°- ( 90°+ 30°)

[ The sum of all the angles of a triangle is 180°]

=> Angle of incidence = 60°

Again , from the 1st law of reflection we have ,

Angle of Incidence = Angle of Reflection .

=> 60°= 60°

Therefore , the angle between the reflected ray and the normal of the second mirror , would be = 60°