What is Lense? Explain its Types and Applications

LENSES

• A lens is an optically transparent medium bounded by two spherical refracting surfaces or one plane and one spherical surface.
• The lens is basically classified into two types.
• They are:
  1. Convex Lens
  2. Concave Lens

Convex or bi-convex lens:

• It is a lens bounded by two spherical surfaces such that it is thicker at the centre than at the edges. A beam of light passing through it, is converged to a point. So, a convex lens is also called a converging lens.

Concave or bi-concave Lens:

• It is a lens bounded by two spherical surfaces such that it is thinner at the centre than at the edges. A parallel beam of light passing through it is diverged or spread out. So, a concave lens is also called a diverging lens.

APPLICATIONS OF CONVEX LENSES

• Convex lenses are used as camera lenses
• They are used as magnifying lenses
• They are used in making microscopes, telescopes and slide projectors
• They are used to correct the defect of vision called hypermetropia

APPLICATIONS OF CONCAVE LENSES

• Concave lenses are used as eye lenses of ‘Galilean Telescope’
• They are used in wide-angle spy holes in doors.
• They are used to correct the defect of vision called ‘myopia’

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