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Two lenses of power -15D and +5 D are in...

Two lenses of power `-15D` and `+5 D` are in contact with each other. The focal length of the combination is

A

`+10cm`

B

`-20 cm`

C

`-10 cm`

D

`+20 cm`

Text Solution

Verified by Experts

The correct Answer is:
C
`p=P_(1) + P_(2),f=100/p`
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