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Two thin lenses of power + 6 D and - 2 D...

Two thin lenses of power `+ 6 D and - 2 D` are in contact. What is the focal length of the combination ?

A

0.5 m

B

0.4 m

C

0.3 m

D

0.25 m

Text Solution

Verified by Experts

The correct Answer is:
D
Power of combination `=P_(1)+P_(2)=+6D-2D=+4D`
`therefore` The focal length of the combination,
`f=(1)/(P)=(1)/(4)=0.25 m`
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