Optics Question 717

Question: Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is

[NCERT 1976; MP PET 1994; CBSE PMT 1996; KCET 1994; MP PMT 1999, 2001]

Options:

A) $ \frac{t}{nc} $

B) $ tnc $

C) $ \frac{nt}{c} $

D) $ \frac{tc}{n} $

Show Answer

Answer:

Correct Answer: C

Solution:

$ time=\frac{distance}{speed}=\frac{t}{c/x}=\frac{nt}{c} $



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