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Revision Notes
Class 10 Science
Chapter 10 Light Reflection and Refraction
Important Terms
Light is a type of energy that can be converted into other types of energy.
Light does not require a physical medium to propagate.
Light's velocity in air or vacuum is 3 10 m / s 8 .
Rectilinear Propagation of Light
Light travels in a straight line in a homogeneous transparent medium, which is
known as rectilinear propagation of light.
Reflection of Light
Reflection of light describes the phenomenon by which a ray of light changes its
propagation direction when it encounters a boundary between different media
through which it cannot pass.
There are two types of reflection of light:
➢ Regular reflection or specular reflection
➢ Irregular reflection or diffused reflection
Regular Reflection
The perfect, mirror-like reflection of light is known as specular or regular
reflection. Regular reflections include reflections in mirrors, water surfaces, and
highly polished floors.
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