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# 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

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ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes by Swiflearn are so far the best and most reliable Revision Notes for ICSE Class 10 Physics. These ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes will surely increase your confidence and reduce the anxiety of examination. Students can download the FREE PDF of  ICSE Class 10 Physics Chapter 5 Refraction Through a Lens Revision Notes, use it to clear all their doubts and queries, and hence, excel in their examination. ## 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 