Question

A thin sheet of refractive index 1.5 and thickness 1 cm is placed in the path of light. What is the path difference observed?

(a) 0.003 m

(b) 0.004 m

(c) 0.005 m

(d) 0.006 m

Answer 1

Correct choice is (c) 0.005 m

For explanation I would say: AS we know, the path difference introduced by the sheet = (μ – 1) t, where t is the thickness of the sheet.

Here, μ = 1.5 and t = 0.01 m

Therefore, Δx = 0.5 X 0.01 m

= 0.005 m.