Question

Two lenses of power +1.5d and -0.5d are kept in a contact on their principal axis. What is the effective power pf combination

Answer 1

the effective power combination is +1d

Answer 2

The effective power of the combination is 1 D.

Explanation:

Given that,

Power of lens 1, $P_1=+1.5\ D$

Power of lens 2, $P_2=-0.5\ D$

To find,

The effective power of combination.

Solution,

The power of the lens are additive in nature. The effective power is given by the sum of powers of two lenses. It is given by :

$P=P_1+P_2$

$P=1.5+(-0.5)$

P = 1 D

So, the effective power of the combination is 1 D.

Learn more,

Effective power pf combination

https://brainly.in/question/5201842