For image magnification, one needs at least

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Two convex lenses

One concave and one convex lens

One concave lens

One convex lens

answer is A.

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Detailed Solution

Concept:

Convex lenses are primarily used to provide magnified images of objects. Creates an upright, magnified virtual image of a small object. The behavior of a convex lens can be explained using the following figure.
Where AB is the object to be considered. The image of this object is magnified, upright and effectively created by a convex lens. This photo is

. This enlarged image is displayed. A convex lens is sufficient to image an object of the corresponding large size. However, if the object is very small, two such condensing lenses are needed to produce an image large enough to be clearly visible.
Therefore, if the object is small, all you need to create a magnified image is a convex lens. However, if the object is very small, you will need two such convex lenses to create the corresponding magnified image.
Hence , the correct option is 1.

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Result Producing online coaching for JEE/NEET of south India

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Best Online Course for NEET

Best Online Course for CBSE