A convex lens forms a virtual image of an object placed at $15 c m$ from the lens. The focal length of the lens can be

2 c m

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8 c m

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15 c m

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18 c m

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Solution

The correct option is C $18 c m$
A virtual image of an object is formed by a convex lens only when the object is placed between the lens and the focus. Therefore the focal length of the lens should be greater than the distance of the object from the lens.

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An object $20 c m$ from a convex lens forms a virtual image $15 c m$ behind the lens. The focal length of the lens is

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10 c m

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Describe the nature of image formed when an object is placed at a distance of 30 cm from a convex lens of focal length 15 cm.

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