How long does it take light to travel through a 3.0 mm thick piece of glass?
What will be an ideal response?
Answer:
thickness of the glass t = 3 mm = 3* 10^-3 m
index of refraction of glass n = 1.5
speed of light in glass v = c/ n
= ( 3* 10^ 8 m / s) / 1.5
= 2* 10^ 8 m / s
time taken to travel t thickness in glass by light is T = t / v
= 1.5*10^-11 s
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