The time taken by sunlight to cross a 5mm thick glass plate u(3/2) is
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Explanation:
refractive index= speed of light in vaccum/speed in medium
3/2=3×10^8/cm
Cm=2×10^8 m/s
speed=distace/time
t= 5×10^-3/2×10^8
t=2.5×10^-11sec
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