Two plane mirrors each 1.6 m long, are facing each other. The distance between the mirrors is 20 cm . A light incident on one end of one of the mirrors at an angle of incidence of 3 0 ∘ . How many tim

Question

Two plane mirrors each 1.6 m long, are facing each other. The distance between the mirrors is 20 cm . A light incident on one end of one of the mirrors at an angle of incidence of 3 0 ∘ . How many times is the ray reflected before it reaches the other end?

TestHub · Accepted Answer

tan 3 0 ∘ = 0.2 x ​ = 3 ​ 1 ​ ⇒ x = 3 ​ 0.2 ​ No. of Reflections ⇒ x 1.6 ​ = 0.2 1.6 ​ 3 ​ ⇒ 8 3 ​ = 13.85 Therefore, the actual number of reflections required is 14 .

Physics - Geometrical Optics Question with Solution | TestHub

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