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Rays from a lens are converging toward a...

Rays from a lens are converging toward a point P, a shown in Figure. How much thick glass plate having refractive index 1.6 must be located between the lens and point P, so that the image will be formed at `P^(')`?

A

0.8cm

B

1.6cm

C

5cm

D

2.4cm

Text Solution

Verified by Experts

The correct Answer is:
A
Due to the insertion of glass plate, the image has to be shifted by 0.3cm.
Shift produced by a glass slab of thickness t and refractive index `mu` is given by `(1-(1)/(mu))`.
So, `t[1-(1)/(1.6)]=0.3rArrt=0.8cm`
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