Two lenses of power +1.5 diopter and +1.0 diopter are placed... | Physics | SolveeIt | Solveeit

Today, August 18

Question

Two lenses of power +1.5 diopter and +1.0 diopter are placed in contact, the effective power of the combination is:

A

2.5 diopter

B

$\frac{3}{5}$ diopter

C

0.5 diopter

D

$\frac{5}{3}$ diopter

Answer

2.5 diopter

Explanation

Solution

Here ${{D}_{1}}=1.5D$ ${{D}_{2}}=1.0D$ Hence, effective power of combination is $D={{D}_{1}}+{{D}_{2}}=1.5+1.0=2.5D$