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The time taken by a ray of light to trav...

The time taken by a ray of light to travel through 5 cm of glass is the same as that through x cm of air. If the R.I. of glass is 1.5 , then the value of x is

A

7.5 cm

B

1.33 cm

C

9cm

D

6 cm

Text Solution

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The correct Answer is:
A
Optical path =`(R.I) xx ` distance travelled in the medium
`=1.5 xx 5 =7.5` cm
Thus it will travel 7.5 cm in air in the same time.
`:.` x=7.5 cm
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