time taken by sunlight to cross a 5mm thick glass plate(mew=3/2)is:
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we know,
when sun light passes through any material of refractive index μ then,
velocity of sun decrease e.g
speed in material = 3* 10⁸ m/s/μ
and we know,
time = distance/speed
here,
distance = 5mm = 5 *10^-3 m
speed = 3*10⁸/(3/2) = 2*10⁸ m/s
so,
time = 5*10^-3/2*10⁸ sec
= 2.5 *10^-11 sec
when sun light passes through any material of refractive index μ then,
velocity of sun decrease e.g
speed in material = 3* 10⁸ m/s/μ
and we know,
time = distance/speed
here,
distance = 5mm = 5 *10^-3 m
speed = 3*10⁸/(3/2) = 2*10⁸ m/s
so,
time = 5*10^-3/2*10⁸ sec
= 2.5 *10^-11 sec
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