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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 O.

A

l

B

3l

C

1.5 l

D

2l

Text Solution

Verified by Experts

In the ray diagram shown
`triangle AQC prop triangle DMC`
`(x)/(l//2)=(3x)/(d)`
`rarr x =(3l)/(2)`
`therefore` Total length `=(3l)/(2)+(3l)/(2)`
=l (option =B)
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