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An object is placed at a distance of 10c...

An object is placed at a distance of 10cm form a co-axial combination of two lenses A and B in contact. The combination forms a real image three times the size of the object. If lens B is concave with a focal length of 30cm. The nature and focal length of lens A is

A

Convex, 12 cm

B

Concave, 12 cm

C

Convex, 6 cm

D

Convex, 18 cm

Text Solution

Verified by Experts

The correct Answer is:
C
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