Question

How will you identify a convex lens, and a concave lens by looking through them?

Answer 1

• The convex lens always has a magnification of $\left|m\right|>1$.
• So, if we look through the convex lens, we will observe an enlarged image of the object we want to see.
• A concave lens has a magnification of $\left|m\right|<1$.
• Thus, we will get a diminished image of the object which we want to observe through a concave lens.
• Therefore, we can identify the concave lens and concave lens by looking through them as in both cases the object size changes differently.