A Plano-convex lens (focal length f_{2}, refractive index _{2}, radius of curvature R) fits exactly into a Plano-concave lens (focal length f_{1}, refractive index 1, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be :

(a)

f_{1} − f_{2}

(b)

f_{1} + f_{2}

(c)

(d)

Question ID - 50829 :-

A Plano-convex lens (focal length f_{2}, refractive index _{2}, radius of curvature R) fits exactly into a Plano-concave lens (focal length f_{1}, refractive index 1, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be :

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