Test: Refraction Of Light - Class 10 MCQ

We know that refractive index of glass slab is 1.5

Here the incidence angle is i=60^o

Using snell's law

n_airsin(i) = n_glasssin(r)

sin60^o = 1.5sinr

=> √3/2 = 1.5sinr

=> 1/√3 = sin r

=> r = 35.26^o ≈ 35^o

When light enters from rarer to denser medium its velocity decreases. Hence the ray bends towards normal.

Light coming from the fish refracts (changes direction) when it hits the surface. A person above the water sees the apparent position of the fish closer to the surface than the real position of the fish.

The bouncing back of light is known as reflection of light while refraction of light is the bending light when it pass through one medium to another

Optical density of Turpentine is maximum so light travel with minimum speed so,
Speed of light maximum in water then kerosene then minimum in Turpentine.

If the refractive index of two medium is same then light wave will travel in a straight line without bending. So we can see that the bending of light will depend upon the refractive index of medium.

As the light travels from denser medium to lighter medium its speed increases.

Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media and is described quantitatively by Snell's Law.

Refractive index of medium 1 with respect to medium 2 =  c2 / c1
⇒   2*10² / 2.5*10² 
⇒     2/2.5

Its because the velocity of light varies according to the medium,as the speed decreases and increases in different medium,this makes light ray to move towards or away from normal by changing its direction or path in that medium.

A coin placed at the bottom ofa tank appears to be raised when water is poured into it. It happens due to the phenomenon of refraction of light. The point from which the refracted rays appear to come gives the apparent position of the coin.