Question

define refraction and it's laws
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Answer 1

Refraction :-

Refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.

Law of refraction :-

1. The incident ray, the normal and the refracted ray at a point of incidence all lie in the same plane.

2. When a ray of light passes through a rarer medium to a denser medium, the refracted ray is closed to the normal while the ray of light passes through a denser medium to a rarer medium, the refracted ray is away from the normal. [for any two mediums, the ratio of the sine of angle of incidence to the angle of sine of refraction is constant which is called refractive index.]

3. An incident ray passing through the normal always goes straight.

Snell's law : It states that the ratio of sine of angle of incidence to the sine of angle of refraction for two mediums is always constant. This constant is known as the refracted index.Refracted index = sin i/sin r##

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Answer 2

Answer:

Bending of light when it goes from one medium to another is called refraction.

LAWS OF REFRACTION

FIRST LAW OF REFRACTION- The incident ray, the refracted ray and the normal at the point of incidence lie on the same plane.

SECOND LAW OF REFRACTION(Snell's law) -The ratio of sine of angle of angle of incidence and sine of angle of refraction is constant for a given pair of media.

THIRD LAW OF REFRACTION-Angle of incidence is not equal to angle of refraction