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Question

A candle placed 25 cm from a lens, forms an image on a screen placed 75 cm on the other end of the lens. The focal length is + 18.75 cm and is a convex lens.


A
True
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B
False
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Solution

The correct option is A True
In concave lens, image is always formed on the same side of the object.
Hence the given lens is a convex lens for which u = – 25 cm, v = 75 cm.
By using 1f=1v1u1f=1(+75)1(25)f=18.75 cm

Physics

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