Question

A plano convex lens having radius of curvature 30cm is placed in air . Find its focal length if it's refractive index is 1.5.
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Answer 1

Answer:

Explanation:

             hey , there is a formula for this

                  i.e,  1/f = (n - 1)[1/R1 - 1/R2]

                                   put R1 = 30 and R2 = ∞ (since plane surface)

                                   put the values and get the value of f

    hope it helps u mate...........let me know