Login

how a light ray refracts through a glass slab

Dear Student
Refraction through a Glass Slab | Class 10, Light-Reflection and Refraction

Refraction is the bending of light when it travels from one medium to another. The refraction of light occurs due to the fact that velocity of light is different for different medium.
The bending is governed by the laws of refraction and for light normal to the surface there is no bending but there is change of velocity of light. (See figure)
Through a glass slab, the light before coming back to the air suffers refraction two times. At the second time, the refracted ray bends away from the normal. If the light is incident at right angles then it will pass through the glass slab without any deviation.

Since, the glass slab is rectangular and both sides of the glass slab have the same medium. The light refracts in such a way that incident and emergent rays are parallel.

Regards

  • 0
View Full Answer
Through a glass slab, the light before coming back to the air suffers refraction two times. At the second time, the refracted ray bends away from the normal. If the light is incident at right angles then it will pass through the glass slab without any deviation.
  • 1

Refraction is the bending of light when it travels from one medium to another. The refraction of light occurs due to the fact that velocity of light is different for different medium. Now the bending is governed by the laws of refraction and for light normal to the surface there is no bending but there is change of velocity of light. (See figure)

  • 1

A light ray incident on a rectangular glass it gets refracted by glass slab. After the refraction it comes out from glass. It gets a interface of a glass and the air (another medium). 

 

 

Here i = r 

So it deviates away from normal. Since, the glass slab is rectangular and both sides of the glass slab have the same medium. The light refracts in such a way that incident and emergent rays are parallel.
The light before coming back to the air suffers refraction two times. At the second time, the refracted ray bends away from the normal. If the light is incident at right angles then it will pass through the glass slab without any deviation.

Regards

 

  • 0
What are you looking for?