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Ray Optics : Rectilinear Propagation of Light and Laws of Reflection

There is one thing not many people know about Science: It’s very simple!! Yes, you heard it right. Behind numerous formulae, derivations and problems, are fewer and simpler laws that, if mastered, can condense the bulk of syllabus into a handful of concepts.

At BYJU’S classes, we are trying to introduce people to the simplicity and beauty of science with our innovative learning techniques. Keeping in line with this motto of ours, we have come up with this article series titled ‘A single concept to explain everything in Ray Optics’ where we will explain the entire theory of Ray optics using a single idea.

In the first article of the series, we will learn about the rectilinear Propagation Of Light and Laws of Reflection. Excited? Let’s get started.

Important Ray Optic Laws

We are all aware of the fundamental laws concerning ray optics which in the simplest terms can be stated as:

  1. Rectilinear propagation of light: Light travels in a straight line.
  2. Law of reflection: Angle of incidence equals the angle of reflection.

Now we are going to be a little more courageous and ask why? Why does light behave the way it does? So are you excited? Please let us know how we may help you further with your JEE preparations in the comments section.

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Frequently Asked Questions on Rectilinear Propagation of Light and Laws of Reflection

What is the reflection of light?

Reflection is a phenomenon in which light travelling in one medium, incident on the surface of another medium, returns to the same medium.

State the laws of reflection.

The incident ray reflected ray and the normal to the surface at the point of incidence all lie on the same plane.
The angle of incidence will be equal to the angle of reflection.

When the light gets reflected, in which plane does the reflected light lie?

The reflected ray lies in the plane of incidence.

What will be the value of the angle of reflection and the angle of deviation when the light ray is incident normally on a reflecting surface?

The angle of reflection is zero.
The angle of deviation is 1800.

Test your Knowledge on Propogation of light

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