Diameter or Aperture of a plano-convex lens is 6 cm and its thickness at the centre is 3 mm. The image
formed is real and twice the size of object. If speed of light in the material of lens is 2 × 10 8 m/s, the distance where object is placed from plano convex lens is ….. × 15 cm.
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Ans. 3
Sol.
(R – 4) 2 + r 2 = R 2 R = 
= 
= 15 cm
= 
μ = 
= 
= 1.5
∴ f = 30cm converging
Now f = 30 cm
= 
– 
= 
– 
m = – 
= – 2
v = – 2u
= 
– 
= 
⇒ u = – 45
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