Question

Two lenses of power 1.5 d plus 1.0d are placed in contact then the effective power of combination will be

Answer 1

P1 +P2 = P

1.5 +1 = 2.5 D

plz mark ans brainliest

Answer 2

The effective power of combination will be  + 2.5 d.

Explanation:

Given,

The power of first lens $(P_{1})$ =  1.5 d and

The power of second lens $(P_{2})$ = + 1.0 d

To find, the effective power of combination (P) = ?

We know that,

The effective power of combination (P) = $P_{1} +P_{2}$

= 1.5 d + (+ 1.0 d)

= 1.5 d + 1.0 d

= + 2.5 d

∴ The effective power of combination (P) = + 2.5 d

Thus, the effective power of combination will be  + 2.5 d.