Class 10 Light – reflection & refraction

Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another


Created by Sanjay Batra Last Updated July 15, 2020 9:18 AM


What's Included

  • 10:12 on-demand video
  • 20 Lectures
  • Access on tablet and phone
  • Certificate of completion


What you'll learn

  • Refraction of light
  • Reflection of light

Course Curriculum

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20 Lectures


Reflection of light 2 Lectures
Concave & convex mirrors and their applications 3 Lectures
Spherical mirrors image formation 1 Lectures
Mirror formula & magnification 2 Lectures
Refraction of light 2 Lectures
Absolute & relative refractive index 2 Lectures
Image formation by spherical lenses 3 Lectures
Lens formula & magnification 3 Lectures


  • None


Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray. (By convention, all angles in geometrical optics are measured with respect to the normal to the surface—that is, to a line perpendicular to the surface.) The reflected ray is always in the plane defined by the incident ray and the normal to the surface. The law of reflection can be used to understand the images produced by plane and curved mirrors. Unlike mirrors, most natural surfaces are rough on the scale of the wavelength of light, and, as a consequence, parallel incident light rays are reflected in many different directions, or diffusely. Diffuse reflection is responsible for the ability to see most illuminated surfaces from any position—rays reach the eyes after reflecting off every portion of the surface


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Sanjay Batra

I am a school teacher teaching maths and physics for Sr. Secondary school students for last 21 years. I have graduated in BSc. (Physics) from Delhi University.