Question

When a lens is placed in a liquid, the total power of the lens is:

Options

• The product of the powers of the two surfaces

• The sum of the powers of the two surfaces: \[P = P_1 + P_2\]

• The difference between the powers of the two surfaces

• Always zero

Answer 1

Since refraction occurs at both curved surfaces in a liquid, the total power of the lens is the sum of the powers of the two surfaces: \[P = P_1 + P_2\].