Question

In a simple microscope, ........................ lens is used.

• A. Concave
• B. Plano concave
• C. Plano convex
• D. Convex

Hint:

A convex lens is used in a simple microscope because it converges light rays and magnifies the object, producing a virtual and enlarged image.

Answer 1

The Correct Option is D

Step 1: Understanding the working of a simple microscope
A simple microscope is an optical device used to magnify small objects. It consists of a single convex lens that produces an enlarged, virtual, and erect image of the object. Step 2: Identifying the correct lens
A convex lens converges light rays, making it suitable for magnification. When an object is placed between the focus and the optical center of a convex lens, it forms a virtual, upright, and magnified image, which is essential for a simple microscope. Step 3: Evaluating the given options
- Concave lens: Produces a diminished, virtual image, not used in simple microscopes.
- Plano concave lens: Used for beam expansion but does not magnify images.
- Plano convex lens: Has one flat and one convex surface, used in optical applications but not commonly for simple microscopes.
- Convex lens: Correct choice as it magnifies objects when used in simple microscopes.
Thus, the correct answer is Convex lens.