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One surface of a lens is convex and the ...

One surface of a lens is convex and the other is concave, if the radii of curvature are `r_(1)` and `r_(2)` respectively, the lens will be convex if

A

`r_(1)gtr_(2)`

B

`r_(1)=r_(2)`

C

`r_(1) lt r_(2)`

D

`r_(1)=(1)/(r_(2))`

Text Solution

Verified by Experts

The correct Answer is:
C
`(1)/(f)=(mu-1)((1)/(r_(1))-(1)/(r_(2)))(1)/(r_(1))-(1)/(r_(2)) gt 6` `r_(1) lt r_(2)`
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