Question

5.
Two lenses of power 2.5 D and 1.5 D are joined
together. The focal length of the new lens
formed is
(A) 500
(B) 25 cm
cm
3
(C) 60 cm
(D) 100 cm​

Answer 1

Answer:

Just simply add their power to get equivalent power.

P=2.5*1.5

P=4.0 D

Power of lense will be +4D

Explanation:

Hope it helps you...