The radius of curvature for a convex lens is 40 cm, for each surface. – McqOptions

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1.	The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be [MP PMT 1989]
A.	40 cm
B.	20 cm
C.	80 cm
D.	30 cm
Answer» B. 20 cm

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