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Ray Optics For IIT JEE 2020 Aspirants

Updated on 15 February 2020
IIT JEE Preparation
6 min read 0 views
Updated on 15 February 2020

This concept is very much important if you are preparing for IIT JEE Exam. A ray of light is the path alongside which the light vitality travels. In observe, a ray has a finite width and is represented in diagrams as straight traces. A beam of light is a set of rays.

A searchlight emits a parallel beam of light. Light from a lamp travels in all instructions which is a divergent beam. A convex lens produces a convergent beam of light when a parallel beam hits the lens.

Remember the basics also when preparing for JEE and your question is how to prepare for JEE, don’t forget to visit us. 


The idea of refraction and the index of refraction are of immense significance. If light travels from level A to level B, then its speed might be highest if it travels in a straight line. However, it has to go by means of numerous materials then it should go via them at completely different speeds and the movement is not going to be in a straight line.

Therefore, when it enters a brand new medium, it will get bent a bit and this bending is termed as refraction. The human eye all the time assumes light to be touring in a straight line and therefore when an object seems to be bent barely as a result of refraction, we assume that the item is bent and never the light.

The index of refraction relies on the medium by which light passes. The speed of light is extra in a medium that's much less optically dense and fewer in additional optically dense mediums.

The mathematical method for calculation of the index of refraction is:

n = Speed of light in the vacuum / Speed of light in the medium = c/v

*Remember this formula if you are in advanced preparation of JEE.

Refraction at spherical Surfaces and by Lenses:

Allow us to now see the refraction of light on the spherical floor. Now, the change in path or bending of a light wave passing from one transparent medium to a different brought on by the change in wave’s speed is the Refraction.

Suppose the above determine is a spherical floor. There may be one medium with refractive index n1 and the second medium with refractive index  n2.

There may be an object O and a ray of light from the item O is incident on the spherical mirror. Since it's shifting from a rarer medium to a denser medium, the ray bends in direction of the conventional.  A picture is shaped and the radius of curvature of a spherical floor is R with the middle C of the spherical floor.

Refraction through a Prism:

A glass prism is a clear object having two triangular ends and three rectangular sides. The refraction of light in glass prism is totally different from a glass slab. It is because, in glass prism, the incident ray of light is just not parallel to the emergent ray of light.

When a ray of light enters the glass prism it will get deviated two instances. The first one was when it enters the glass prism and second, the second one was when it comes out of the prism.

It is because the refracting surfaces of the prism should not parallel to one another. Additionally, when the ray of light passes by the prism it bends in the direction of its base.

TIPS:- When preparing for IIT JEE 2020 in advance, you must remember the basic definitions too. How you are preparing for JEE is also important. Keep going and all the very best for your JEE preparation.

All The Best To All The IIT JEE 2020 Aspirants !

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