Study Guides/Physics/Types of Lenses
Study Guide · Physics

Types of Lenses in Physics

A lens is a transparent piece of glass that refracts (bends) light to form images. Lenses are the fundamental components of eyes, cameras, microscopes, and telescopes. In Class 10 Physics, two main types of lenses are studied.

Question (Click to Flip)

What are the two types of lenses?

Answer

The two main types of lenses are: 1) Convex Lens (converging), which is thicker in the middle and bends light inward toward a focal point. 2) Concave Lens (diverging), which is thinner in the middle and spreads light outward.

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Key Facts

Convex Lens: Converging; used to correct hypermetropia.

Concave Lens: Diverging; used to correct myopia.

Power of Lens: P = 1/f (in metres); measured in Diopters (D).

1. Convex Lens (Converging Lens)

  • Shape: Thicker in the middle, thinner at the edges (like a lentil/daal).
  • Action: It converges (brings together) parallel rays of light to meet at a single point called the principal focus (F).
  • Image: Can form real, inverted images OR virtual, erect images depending on object distance.
  • Power: Positive (+).
  • Uses: Used in microscopes, telescopes, cameras, projectors, and to correct Hypermetropia (farsightedness).

2. Concave Lens (Diverging Lens)

  • Shape: Thinner in the middle, thicker at the edges (like a cave — curved inward).
  • Action: It diverges (spreads apart) parallel rays of light away from the principal focus.
  • Image: Always forms a virtual, erect, and diminished (smaller) image, regardless of object distance.
  • Power: Negative (−).
  • Uses: Used in telescopes (as eyepiece) and to correct Myopia (shortsightedness/nearsightedness).

Questions and Answers

What are the two types of lenses?+

The two main types of lenses are: 1) Convex Lens (converging), which is thicker in the middle and bends light inward toward a focal point. 2) Concave Lens (diverging), which is thinner in the middle and spreads light outward.

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