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Find the focal length of plano-convex le...

Find the focal length of plano-convex lens of material having refractive index of 1.5. Radius of curvature of convex surface is 10 cm.

A

20 cm

B

30cm

C

50 cm

D

40 cm

Text Solution

Verified by Experts

The correct Answer is:
A
We can apply lens marker.s formula as follows :
`(1)/(f)=(mu-1)((1)/(R_(1))-(1)/(R_(2)))`
`rArr" "(1)/(f)=(1.5)((1)/(10)-(1)/(oo))`
`rArr" "f=20cm`.
Hence, option (a) is correct.
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