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Radius of curvature of a convex curved s...

Radius of curvature of a convex curved surface is 50 cm. If refractive index of medium is 1.5, then find 1st and 2nd focal length.

A

-100 cm, 150 cm

B

-150 cm, 100 cm

C

100 cm, -150 cm

D

150 cm, -100 cm

Text Solution

Verified by Experts

The correct Answer is:
A, C
`f_1=-(R)/(n-1)=-(50)/(1.5-1)=-100` cm
`f_2=-(nR)/(n-1)`
`=((1.5)(50))/(1.5-1)=150` cm
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