Question

Type of lense used in magnifying glass :

• A. Concave
• B. Plane
• C. Convex
• D. Oblique

Answer 1

Answer:

C. Convex

• Correct Answer : Convex

Magnifying Glass and Lenses:

• A magnifying glass uses a convex lens to make objects appear larger than they actually are. When an object is placed within the focal length of a convex lens, it produces a virtual, erect, and magnified image.

Key Facts about Lenses:

• Convex Lens (Converging Lens):

  • Thicker at the center than at the edges

  • Converges light rays to a focal point

  • Used in magnifying glasses, cameras, microscopes, telescopes, and spectacles for farsightedness (hypermetropia)

  • Also called a converging lens

• Concave Lens (Diverging Lens):

  • Thicker at the edges than at the center

  • Diverges light rays away from a focal point

  • Used in spy-holes, flashlights, and spectacles for nearsightedness (myopia)

  • Also called a diverging lens

Important Related Facts:

• The focal length of a convex lens determines its magnifying power — shorter the focal length, greater the magnification

• A magnifying glass typically has a focal length between 25mm to 300mm

• The power of a lens is measured in Diopters (D) and is the reciprocal of focal length in meters

• Simple microscopes work on the same principle as a magnifying glass