Question

A convex lens of Focal length of 40cm is in contact

with a concave lens of focal length 25cm. The power

of the combination is.

(1) -1.5 D (2) -6.5 D

(3) +6.5 D (4) +6.67 D

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Answer 1

Answer:

1.-1.5D

Explanation:

25/100-40/100=-15/100

Answer 2

Answer:

1.5D is your answer.......