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A plane convex lens of refractive index 1.5 and radius of curvature 30 ~cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens an object be placed in order to have a real image of the size of the object?

Options

  1. A20 ~cm
  2. B30 ~cm
  3. C60 ~cm
  4. D80 ~cm

Correct answer

A. 20 ~cm

Step-by-step solution

aligned & 1 F = 2 f₁ + 1 f_m & and 1 f₁ =(1.5-1) ( 1 - 1 -30 )= 1 60 & and f_m=15 ~cm . & F=10 ~cm . aligned Object should be placed at 20 ~cm from the lens.

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