when a ray of light enters from denser medium to rara medium it bends a)Towards normal b)A way from normal c)perpendicular to normal d)parallel to normal
Answers
Case 1: When light rays travel from optically rarer medium to denser medium then they bend towards normal. In this case angle of refraction is smaller than angel of incidence.
When light rays travel from air into glass or from air into water, it bends towards normal. This is because the speed of light rays decrease while travelling from air into glass or water.
Jagranjosh
Case 2: When light rays travel from optically denser medium to rarer medium then they bend away from the normal. In this case the angle of refraction is greater than angle of incidence.
When light rays travel from glass into air or from water into air they bend away from the normal. The speed of light rays increase while travelling from glass or water into air.
Jagranjosh
Case of light going from air into glass and again into air
In this case refraction of light takes place two times. One when it enters the glass slab from air and second time when it enters the air through glass slab.
When light rays travelling through air enters glass slab, they get refracted and bend towards the normal. Now the direction of refracted ray changes again when it comes out of the glass slab into air. Since the ray of light I know travelling from denser medium to rarer medium, it bends away from the normal.
In this case incident ray and the emergent ray are parallel to each other. The perpendicular distance between the original path of incident ray and the emergent ray coming out of the glass slab is called lateral displacement of the emergent ray of light and the angle which the emergent ray makes with the normal is called the angle of emergence.
Jagranjosh
Light falling perpendicularly on glass slab
When light falls perpendicularly or normally on the surface of a glass slab, it goes straight. There is no bending of ray of light on entering the glass slab or coming out of it. In this case angle of incidence and angle of refraction is zero.
The same happens if the ray of light falls perpendicularly on the surface of water.
Jagranjosh
Effects of refraction of light
It is due to refraction of light that when we hold a stick obliquely and partially immersed in water it appears to be bend at the surface of water.
Jagranjosh
An object appears to be raised when paced under water.
Pool of water appears less deep than it actually is.
If a lemon is kept in a glass of water it appears to be bigger when viewed from the sides of glass.
It is due to refraction of light that stars appear to twinkle at night.
Laws of refraction of light
1) The incident ray, refracted ray and normal at the point of incidence, all lie in the same plane, i.e. the surface.
Jagranjosh
2) The ratio of sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media.
Sine of angle of incidence/ sine of angle of refraction = Constant
Constant is called refractive index.
Or Sine i/ Sine r = constant
The refractive index of a medium helps to know the light-bending ability of that medium.
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Answer:
a
Explanation:
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