object in error medium and convex surface is to word rarer medium
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Refraction at Spherical Surface and by Lenses
Table of contents
Basic Concepts
Laws of Refraction
Refraction by Spherical Lenses
Optical Centre and Principal Axis of a Lens
Image formation by Lens
Sign Convention for Spherical Lenses
Formation of Image by a Convex Lens
General formula for Lens
Magnification produced by Lenses
Power of a Lens
Power of Combined Lenses
Uses of a Concave and Convex Lens
Frequently Asked Question (FAQs)
Basic Concepts
Refraction: The bending of light when it travels from one medium to another is known as Refraction. Normally, when a light travels from a denser medium to a rarer medium, the light changes its direction and moves away from the normal and while travelling from lighter medium to a denser medium it shifts its direction and moves closer to the normal.
Cause of Refraction: The main reason why the light changes its direction while travelling from one medium to another depends on the factor known as Refractive Index of the Material. As the refractive index is different for different medium, thus the speed of the light changes while travelling through them, resulting in the change of direction.
Optically Rarer and Denser Medium: A medium is said to be optically denser, when the speed of the light is more in that medium. Similarly when the speed of a light is less in a medium, it is said to be an optically rarer medium.