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A lens of power +3.5D is placed in conta...

A lens of power +3.5D is placed in contact with a lens of power -2.5 D. The combination will behave like

A

a converging lens of focal length 100 cm

B

a diverging lens of focal length 100 cm

C

a converging lens of focal length 200 cm

D

a diverging lens of focal length 200 cm

Text Solution

Verified by Experts

The correct Answer is:
A
The power of combination is `(+3.5-2.5)=+1D`
`therefore` The focal length of the combined lens
`=(100)/(D)=100 cm`
and since D is +ve, the combination will act as a converging lens of f = 100 cm
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