Question

13.a) Derive expression for lens makers formula.
b) The plane faces of two identical plano-convex lenses each having focal length of
40 cm are pressed against each other to form a usual convex lens. The distance from
this lens, at which an object must be placed to obtain a real, inverted image with
magnification one is?​

Answer 1

Answer:

Here is your answer in explanation

Explanation:

A} Ans} Consider a thin convex lens made of a material of absolute refractive index n2 , placed in a rarer medium of absolute refractive index n1. Also, n = n2 / n1 be the refractive index of the material of the lens with respect to the medium surrounding it.

B}Ans} The plane faces of two identical plano convex lenses each having focal length of

are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is 40.

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