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Refraction is considered one of the most asked concept.
16 Questions around this concept.
A transparent solid cylindrical rod has a refractive index of It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure.
The incident angle for which the light ray grazes along the wall of the rod is
A light ray falls on a glass surface of the refractive index at an angle . The angle between the refracted and reflected rays would be.
Refraction
Deviation or bending of light rays from their original path while passing from one medium to another is called refraction. It is due to change in the speed of light as light passes from one medium to another medium. If the light is incident normally then it goes to the second medium without bending, but still, it is called refraction. When a light ray passes from one medium to another such that
it undergoes a change in velocity, refraction takes place. Hence, the wavelength of light changes, but frequency remains the same.
Types of medium:
Refractive index: Refractive index of a medium is defined as the factor by which speed of light reduces as compared to the speed of light in vacuum.
When light moves from denser to a rarer medium, it bends away from the normal.
When light moves from rarer to denser medium, it bends towards the normal.
Laws of refraction:
Also,
For applying in problems remember
= refractive index of the second medium with respect to the first medium.
Deviation due to refraction:
Deviation of ray incident at and refracted at is given by :
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