Reflection and refraction

This lesson will discuss and show easily the difference between reflection and refraction.

What is reflection?

When a beam of light reaches a mirror, the light does not travel through the mirror. Instead, the mirror's surface returns the light back into the air. The light is reflected.

Sound waves can also be reflected. This happens when you hear an echo. An echo is a sound that is return to you because the sound waves are reflected back.

There is no doubt you have seen examples of reflection in your lifetime.

You have seen your face reflected in a mirror, in a quiet water of lakes, or some other smooth surfaces.

The surface of a water though does not produce a clear reflection. A long time ago, the Egyptians used polished metal mirrors to view their images.These were not perfect either, but they did the job.

A metal surface just like a mirror is rigid to light waves. When light shines upon the metal surface, it does not propagate into the metal. Instead, it is reflected back.

Today, mirrors can produce great reflection as they are produced by the evaporation of aluminum or silver onto highly polished glass.

What is refraction?

Water is not as rigid as a metal surface. Light can actually propagate into the water. When light passes from air into water, something interesting happens. The direction of the light waves changes as they enter the water. This is called refraction.

A great example of refraction is when you put a pencil in a glass of water. The pencil appears to be bent!

Refraction

Take a close look at the image above where we put a pencil inside a glass of water. You will see that the portion of the pencil that is submerged appears to be bent. 

Difference between reflection and refraction

With reflection, light waves bounces off a medium while with refraction, light waves enter the medium and change direction.

Recent Articles

  1. Introduction to Physics

    Nov 18, 20 01:20 PM

    Top-notch introduction to physics. One stop resource to a deep understanding of important concepts in physics

    Read More

New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.

                                 Follow me on Pinterest

Real Life Math Skills

Learn about investing money, budgeting your money, paying taxes, mortgage loans, and even the math involved in playing baseball.