![]() ![]() Index of refraction: n = c/v, where the speed of light in a medium is v and c is the speed of light in vacuum.Refractive index: The speed of light in a given material is related to a quantity called the refractive index, n, which is defined as the ratio of the speed of light in vacuum to the speed of light in the medium.When light travels through something else, such as glass, water or oil it travels at a different speed.The speed of light in a vacuum is 3.00 x 10 s m/s.If i is the angle of incidence and r is the angle of refraction, then: This law is also known as Snell’s law of refraction. The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media.The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane. ![]() ![]() Snell’s law gives the relationship between angles of incidence and angle of refraction. Snell’s law: The law of refraction is also known as Snell’s law.Refraction: When light travels from one medium to another, it generally bends,this bending is called refraction.NCERT Class 10 Science Lab Manual – Refraction Through Glass SlabĬlass 10 Physics Practical Glass Slab Introduction ![]()
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