Optics 3 Question 25

25. A convex lens of focal length 40cm is in contact with a concave lens of focal length 25cm. The power of the combination is

(1982, 3M)

(a) 1.5D

(b) 6.5D

(c) +6.5D

(d) +6.67D

Objective Question II (One or more correct option)

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Answer:

Correct Answer: 25. (a)

Solution:

  1. P=P1+P2=1f1(m)+1f2(m)=10.410.25=1.5D


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