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Overview

Reflection of light is the phenomenon of bouncing back of light in a similar medium on striking the surface of any object. The incident ray, the refracted ray and the ordinary to the interface of two transparent media at the purpose of incidence, all lie in a similar plane.

Basic Requirement

  • Class 10 Student

Skills Covered

  • Refraction Of Light

  • Refraction Laws

Expert Review

Physics Chapter 4 Refraction of Light at Plane Surfaces Revision Notes for ICSE Class 10

For conceptual understanding and to get good marks, revision is very important, and revision notes are always considered the best method. The ICSE Class 10 Physics Chapter 4 Refraction of Light at Plane Surfaces Revision Notes is one of the most important pieces of study material that students can receive, as they will aid them in studying better and reduce the level of stress that students face when preparing for their exams.

Refraction of Light

As light passes through two transparent media, its path changes direction. This is referred to as refraction.

1) The refraction of light is primarily a surface phenomenon.

2) It is caused by the change in speed of light from one medium to another that causes refraction.

3) Points to remember

4) When light passes through a medium at a slower rate, it is said to be optically dense.

5) If light speeds up in a medium, it is said to be rarer.

6) The boundary between two media causes partial reflection and refraction.

Terms you need to know

1) Incident ray – A ray that crosses a boundary to enter another medium.

2) Refracted ray – After deviation, the ray in the second medium

3) Normal – Perpendicular to the incident ray at the boundary of separation.

4) The angle of incidence (i) – The angle between the incident and normal rays.

5) The angle of refraction (r) – The angle between a normal ray and a refracted ray.

Here are a few salient points

1) Light bends towards the normal when traveling from a rarer medium to a denser medium, i.e. the angle of refraction is smaller than the angle of incidence.

2) The angle of refraction is greater than the angle of incidence when light travels from a denser to a rarer medium.

3) Refraction conditions prevent light rays from changing directions.

4) Rays of light that pass from one medium to another at a right angle to the surface that separates the two media do not bend, i.e. they continue in their original direction.

5) Medium 2 has the same refractive index as medium 1


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Course creator


                                 Yogesh P

Yogesh P

I Am School Teacher having more than 12 years of experience subject of Physics in ICSE and CBSE Schools. Also, I have done M.Sc., B.Ed. And presently pursuing post-graduation diploma in school leadership and Management.