Optics Question 719

Question: Light takes 8 min 20 sec to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time ( $ _{a}{\mu _{w}}=4/3 $ )

Options:

A) 8 min 20 sec

B) 8 min

C) 6 min 11 sec

D) 11 min 6 sec

Show Answer

Answer:

Correct Answer: D

Solution:

$ \mu =\frac{c _{a}}{c _{w}}=\frac{t _{w}}{t _{a}}\Rightarrow t _{w}=\frac{25}{3}\times \frac{4}{9}=11\frac{1}{9}=11 $ min 6 sec



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