What is refraction ? Explain with a ray diagram.
Answers
Question:
What is refraction?
Answer:
Refraction is the change in the direction of a wave passing from one medium to another. Refraction is the bending of a wave when it passes from one medium to another. The bending is caused due to the differences in density between the two substances.
Refraction of light is one of the most commonly observed phenomena, but other waves like sound waves and water waves also experience refraction. Refraction makes it possible for us to have optical instruments such as magnifying glasses, lenses and prisms. It is also because of the refraction of light that we are able to focus light on to our retina.
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Refraction of light in glass is shown (in the figure above). When light travels from air into glass, the light slows down and changes direction slightly.
When light travels from a less dense substance to a denser substance, the refracted light bends more towards the normal line. If the light wave approaches the boundary in a direction that is perpendicular to it, the light ray doesn’t refract in spite of the change in speed.
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★Laws of Refraction of Light:-
- The incident ray, refracted ray, and the normal to the interface of two media at the point of incidence all lie on the same plane.
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- The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. This is also known as Snell’s law of refraction.
{sin(i) : sin(r) = constant}
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Hope it helps! ❣️
