Question

Two mirrors are arranged as shown in the figure light is incident on the first mirror at angle of 35º. The light reflects towards a second mirror. Determine the angle 8 and net angle of deviation A) 20.40° ACW B) 15,80°C C) 20.40°CW D) 15.40° CW ..340​

Answer 1

Explanation:

Correct option is A)

Given: Two mirrors are arranged as shown in the figure. Light is incident on the first mirror at an angle of 35

∘

. The light reflects towards a second mirror.

To find: the angle θ

Solution:

From the above figure, angle of incidence of the first light ray is 35

∘

.

Hence the angle between the first incident ray the mirror is (90

∘

−35

∘

) i.e., 55

∘

By observation OAB forms a triangle,

∠A=55+35+35=125

∘

Hence, For the triangle, 40+125+θ=180

∘

⟹θ=15

∘

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