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Q.

A concave and convex lens have the same focal length of 20 cm and are put into contact to form a lens combination. The combination is used to view an object of 5 cm length kept at 20 cm from the lens combination. As compared to the object, the image will be

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a

Of the same size as the object and erect

b

Of the same size as the object but inverted

c

Magnified and inverted

d

Reduced and erect

answer is C.

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Detailed Solution

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Resultant focal length =∞

∴ It behaves as a plane slab of glass

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