Question

What type of lens is this?

Answer 1

The lens type is concave

Answer 2

Tip: A convex lens is thicker at the centre than at the edges.

When light goes through a concave lens, the light that goes through that lens spreads out more due to the structure of the surface of the lens. A concave lens does not form a focal point at the opposing side of the lens. Instead, it spreads out, doing the exact opposite of what a convex lens does. In the picture, we see a lens where the light goes through and unifies at the opposing side, which is what a convex lens does. So, the lens in that image is a convex lens.

3. What type of lens is this?

Answer: Convex

Wrong Answer: Concave