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Q.

A concave and a convex lens have the same focal length of 20 cm  and are put in 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

Magnified and inverted

b

Reduced and erect

c

Of the same size as the object and would be erect

d

Of the same size as the object, but would be inverted

answer is C.

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Detailed Solution

As f1=−20 cm  and f2=20 cm ∴   F=∞ . The combination behaves as a plane refracting surface. Hence image is erect and of same size.
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