Question

Two power of a converging lens is 4 D and that of a diverging lens is 2.5D.The power of this combination of lenses placed closed together is:

• A. +1.5 D
• B. +7.5 d
• C. -7.5 d
• D. -1.5 D

Answer 1

The correct option is A +1.5 D

Converging lens$=4D$
diverging lens$=2.5D$
resultant power$=c$ lens$-d$ lens
$=>4-2.5$
$=>1.5D$
the combined lens will have a converging nature$.$

Hence,

option $\left(A\right)$ is correct answer.