Question

Distinguish between a concave and a convex lens with their uses.

Hint:

A {concave lens} is also called a {diverging lens}, while a {convex lens} is called a {converging lens}.

Answer 1

Concept: Lenses are transparent optical devices that refract light and form images. The two main types of lenses are concave lens and convex lens. They differ in shape, behavior of light rays, and their applications.
Step 1:Difference between Concave and Convex Lens} \begin{center} \begin{tabular}{|c|c|c|} \hline Feature & Concave Lens & Convex Lens
\hline Shape & Thinner at the center and thicker at the edges & Thicker at the center and thinner at the edges
\hline Nature of rays & Diverges light rays & Converges light rays
\hline Image formation & Always forms virtual, erect, and smaller image & Can form real or virtual images depending on position
\hline \end{tabular} \end{center}
Step 2:Uses of Concave Lens}

• Used in spectacles to correct myopia (short-sightedness).
• Used in door viewers or peepholes.

Step 3:Uses of Convex Lens}

• Used in spectacles to correct hypermetropia (long-sightedness).
• Used in magnifying glasses, cameras, microscopes, and telescopes.