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
