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A converging beam of rays in incident on...

A converging beam of rays in incident on a diverging lens. Having passed through the lens the rays intersect at a point `15 cm` from the lens. If the lens is removed, the point where the rays meet, move `5 cm` closer to the mounting that holds the lens. Find the focal length of the lens.

A

`-30cm`

B

`5cm`

C

`-10cm`

D

20cm

Text Solution

Verified by Experts

The correct Answer is:
A

`(1)/(f)=(1)/(v)-(1)/(u)=(1)/(15)-(1)/(10)=(-1)/(30)`
`f=-30cm`
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