Q.

A convex lens of power + 6D is placed in contact with a concave lens of power – 4D.  What is the nature and focal length of the combination

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a

Concave, 25 cm

b

Convex, 50 cm

c

Concave, 20 cm

d

Convex, 100 cm

answer is B.

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Detailed Solution

P=P1+P2⇒P=+6−4=+2D. So focal length  f=1002=+50cm; convex lens
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A convex lens of power + 6D is placed in contact with a concave lens of power – 4D.  What is the nature and focal length of the combination