The radius of curvature of a double concave lens is 20 cm. If the refractive index of glass with respect to air is 5/3 then, the focal length of this lens is - Study24x7
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81 followers study24x7 05 Jun 2021 12:25 PM study24x7 study24x7

The radius of curvature of a double concave lens is 20 cm. If the refractive index of glass with respect to air is 5/3 then, the focal length of this lens is

A

5 cm

B

15 cm

C

‒ 15 cm

D

 20 cm

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