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a convex lens of power +6 dioptre is pla...

a convex lens of power `+6` dioptre is placed in contact with a concave lens of power`-4` dioptre. What will be the nature and focal length of this combination?

A

concave ,25cm

B

convex,50cm

C

Concave, 20cm

D

Convex,100cm

Text Solution

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The correct Answer is:
B
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