Light takes 8 minutes 20 seconds to reach from the sun on the earth. If the whole atmosphere is filled with water, the light will take the time (μw=43):
A
8 minutes 20 seconds
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B
8 minutes
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C
6 minutes 11 seconds
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D
11 minutes 6 seconds
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Solution
The correct option is D11 minutes 6 seconds The refractive index, n is given as;
n=cv
Where:
c= speed of light in vacuum.
v= speed of light in medium.
Therefore,
for water,
43=cv
v=3c4
With speed c, time taken =8min20sec=500sec
Therefore, with speed 3c4
Time taken =666.67sec=11min6sec
Thus, if the atmosphere is filled with water, the sunlight will take 11 min 6 seconds to reach to earth surface.