If a lens is submerged in water, what happens to its focal length?
A) It decreases.
B) It stays the same.
C) It becomes negative.
D) It increases.

Question

Quizplus · Accepted Answer

The focal length of a lens depends on the refractive index of the medium surrounding it. When a lens is submerged in water, the difference in refractive indices between the lens material and water is less than that between the lens material and air, causing the focal length to increase.

If a Lens Is Submerged in Water, What Happens to Its