A burning candle whose flame is 1.5 cm tall is placed at a certain distance in front of a convex lens. An image of candle flame is received on a white screen kept behind the lens. The image of flame also measures 1.5 cm. If f is the focal length of convex lens, the candle is placed:

(a) at f
(b) between f and 2f
(c) at 2f
(d) beyond 2f

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Solution

(c) at 2f

This is because a convex lens produces an image of the same size as the object when the object is placed at 2f.

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Question 35
The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

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(c) at 2f This is because a convex lens produces an image of the same size as the object when the object is placed at 2f.

(c) at 2f

This is because a convex lens produces an image of the same size as the object when the object is placed at 2f.