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A man is travelling on the rod along AB...

A man is travelling on the rod along AB. Find out the length of the road for which the image will be visible to him.

A

`l`

B

`3l`

C

`1.5 l`

D

`2l`

Text Solution

Verified by Experts

The correct Answer is:
B
In the ray diagram shown
`Delta AQC ~ Delta DMC`
`x/(l//2)=(3d)/d`
`rArr x=(3l)/2`
`:.` Total length `=(3l)/2+(3l)/2`
`=3l`

Note : Most of the problem in optics involving geometry can be solved by using similar triangles.
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MOTION-GEOMETRICAL OPTICS-Exercise - 4 | Level-II
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