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Standard X

Physics

Mirror Formula and Magnification

A convex lens...

Question

A convex lens $L 1$ forms an image of the same size as that of the object at a distance of $24 c m$ . If the lens $L 1$ is replaced by another convex lens $L 2$ , the image formed is magnified and erect. Therefore, the focal length of $L 2$ is

less than

12 c m

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12 c m

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between

12 c m

and

24 c m

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more than

24 c m

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Solution

The correct option is D
more than $24 c m$
An erect image is formed by $L 2$ so it must be a virtual image. A convex lens forms a virtual and erect image when an object is placed between focus and optical centre of the lens. Hence the object distance that is $24 c m$ is less than the focal length of $L 2$ . Hence, the focal length of $L 2$ is more than $24 c m .$

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A convex lens L1 forms an image of the same size as that of the object at a distance of 24 cm. If the lens L1 is replaced by another convex lens L2, the image formed is magnified and erect. Therefore, the focal length of L2 is

A convex lens $L 1$ forms an image of the same size as that of the object at a distance of $24 c m$ . If the lens $L 1$ is replaced by another convex lens $L 2$ , the image formed is magnified and erect. Therefore, the focal length of $L 2$ is