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Shown an object and its image formed by ...

Shown an object and its image formed by a thin lens. Then the nature and focal length of lens is

A

`f=4.8cm` converging lens

B

`f=-4.8 cm ` diverging lens

C

`f=2.18cm` converging lens

D

`f=-2.18cm` diverging lens

Text Solution

Verified by Experts

The correct Answer is:
b.
`(1)/(v)-(1)/(u)=(1)/(f)`
`v=-3cm,u=-8cm`
`(1)/(-3)-(1)/(-8)=(-8+3)/(24)=(-5)/(24)`
`f=(-24)/(5) cm=-4.8cm` (diverging lens)
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