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Two convex lenses of powers 4D and 6D ar...

Two convex lenses of powers `4D` and `6D` are separated by a distance of `(1)/(6)m` . The power of the optical system so formed is

A

`-6D`

B

`+6 D`

C

`10 D`

D

`2 D`

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(F)=(1)/(f_(1))+(1)/(f_(2))-(d)/(f_(1)f_(2))`
`P=P_(1)+P_(2)-dP_(1)P_(2)`
`=4+6-(1)/(6)xx4xx6=6D`
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