Two adjoining plane mirrors are separated by an angle of 100°. light is incident on the first mirror at an angle of 70°. the light reflects toward the second mirror and is then reflected from it. at what angle is the light reflected from the second mirror?

The light is reflected at an angle of 30 degrees from the second mirror.

Explanation:

The situation is shown in the attached figure

As  we know that angle of incidence equals angle of reflection thus all the angles are calculated in the same manner

Angle i = 70 Thus angle r = 70 as angle of incidence and reflection are same

In triangle BFC

angle FCB equals 180 - 100 - 20 = 60 degrees

Thus The angle i' equals 90 - 60 =30 degrees

Thus the final angle of reflection is also 30 degrees.

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