Question

25. Two thin lenses have combined power of 10 D. When
separated by 20 cm their equivalent power is 6.25 D. Their
individual powers in D are :
(a) 3.5 and 6.5
(b) 5 and 5
(c) 7.5 and 2.5
(d) 9.0 and 1​

Answer 1

Answer:

Correct option (c) 7.5 and 2.5

Explanation:

The equivalent power of two lenses is given