A Plano convex lens ( μ = 1.5) of focal length 20 cm has it…

Physics Ray Optics Mix MCQ (Single Correct)

A Plano convex lens ( μ = 1.5) of focal length 20 cm has its plane side silvered -

The radius of curvature of its curved surface is half that of a surface of equiconvex lens of focal length 20 cm made of same material

An object place at 15 cm on the axis on the convex side gives rise to an image at a distance of 30 cm from it

Object located at a distance of 20 cm on the axis on the convex side gives rise to an image at 40 cm from it

Acts as a convex mirror

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a, b)

= =

⇒ = = ( μ – 1)

⇒ equiconvex lens of f = 20 cm with radius of curvature = 2R

F eq = – 10 cm like a concave mirror

⇒ v = – 30 cm

for u = – 20 cm

v = – 20 cm, so C is wrong

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