Four lenses are made from the same type of glass. The radius of curvature of each face is given below. Which will have the greatest positive power ?
Text Solution
Verified by ExpertsThe correct answer is:
A
Appplying the lens maker’s formula
= p = (n – 1) 
we know that the greater positive power is for that material for which 
– 
is maximum and positive. For this condition R 1 and R 2 should be small as possible but still it must be positive, therefore we must sellect the combination which has less radius of curvature for convex lens. Hence, option is correct.
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