ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes

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ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes

 

Revision is very important for better conceptual understanding and securing good marks, and for Revision, Revision Notes are always considered the best. ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes are one of the most important pieces of study material that students can receive, as it will aid them to study better and reduce the level of stress that students face during the hectic year

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Lens

 

A lens is a transparent refracting medium bounded by two curved surfaces which are generally spherical.

  • Convex lens or converging lens converges light rays as shown in figure 1.
  • Concave lens or diverging lens diverges light rays as shown in figure 2.

 

 

Type of Lens

 

  • A convex lens bends the ray of light towards its middle i.e. it converges the light.
  • A concave lens bends the ray of light towards its edges i.e. it diverges the light.

 

Important Terms

 

  • The centre of curvature of a lens is usually represented by the letter C. Since there are two centres of curvature, we may represent them as C1 and C2.
  • The radius of the sphere, of which the part is the lens surface is called the radius of curvature of that surface of the lens.
  • An imaginary straight line passing through the two centres of curvature of the lens is called its principal axis.
  • The central point of a lens is its optical centre. It is usually represented by the letter O. A ray of light through the optical centre of a lens passes without suffering any deviation.
  • The effective diameter of the circular outline of a spherical lens is called its aperture.
  • A lens has two principal foci F1 and F2. F1 is the first focal point and F2 is the second focal point.
  • The distance of the principal focus from the optical centre of a lens is called its focal length. The letter f is used to represent the focal length.
  1. f1 is the first focal length (the distance of O from F1).
  2. f2 is the first focal length (the distance of O from F2).

 

 

 

ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes

 

Refraction Through A Lens

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