Which one among the following is used in a simple microscope?

The correct answer is Converging lens.

Key Points

• A simple microscope uses a converging lens (also known as a convex lens) to magnify objects.
• The convex lens creates a magnified, virtual, and erect image of the object when placed at a distance shorter than the focal length of the lens.
• It is commonly used for low-magnification observations, such as reading fine print or examining small objects.
• The lens works based on the principle of refraction, bending light rays to converge and form an enlarged image visible to the human eye.
• Simple microscopes are easy to use and are often utilized in educational and general-purpose applications.

Additional Information

• Converging Lens (Convex Lens):
  • A lens that is thicker at the center than at the edges, capable of focusing light rays to a single point (focal point).
  • It is widely used in devices such as magnifying glasses, cameras, and telescopes.
  • The focal length determines the degree of magnification achievable by the lens.
• Magnification:
  • Magnification refers to how much larger or smaller the image of an object appears compared to the object itself.
  • In a simple microscope, magnification is achieved by positioning the object within the focal length of the lens.
• Virtual Image:
  • A virtual image is formed when light rays appear to diverge from a point, but do not actually meet.
  • In a simple microscope, the image is virtual, meaning it cannot be projected onto a screen.
• Other Types of Lenses:
  • Diverging lens (concave lens): Produces a virtual, diminished image and is not used in simple microscopes.
  • Plane mirrors: Used to reflect light, but do not magnify images, hence unsuitable for microscopes.