Q.

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,

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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

answer is A.

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Detailed 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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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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Best Books for NEET
How to Join IIT after 10th
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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,