Question

Three lenses having power 2, 2.5 and 1.7D arekept touching in a row. What is the total power of the lens combination?​

Answer 1

Answer:

The Power of the Combined Lenses would be +6.2D

Explanation:

When the lenses are placed in row each other they would form a combined lens which would have net effective power of the lenses placed

If the lenses are +2 , +2.5 , +1.7

then the combine lens would produce  a Power of    2 + 2.5 + 1.7 = +6.2D