First slide

The lens

Question

A convex lens of focal length 10 cm is painted back at the middle portion as shown in figure. An object is placed at a distance of 20 cm from the lens. Then,

Moderate

A

Only one image will be formed by the lens
B

the distance between the two images formed by such a lens is 6 mm
C

the distance between the images is 4 mm
D

the distance between the images is 2 mm

Solution

Only one image will be formed by this lens system because optic axis of both the parts coincide. Two images would have formed if their optic axis were different.

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