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Class 6
Lesson Notes
Subject- Physics
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Ch. – Light, Shadows and Reflectionn
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Subtopic- Transparent, Translucent and Opaquee;
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Rectilinear propagation of lightt
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NOTES:
A substance through which light propagates, act as s medium.
A s u b st a n c e t h r o u g h w h i ch l i g h t p r o p a g a t e s, a c t a

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Different materials can be broadly categorized into three typess-
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1. transparent
2. translucent
3. Opaque materials.

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Materials through which light can pass ss completely are called transparent
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materials. For e.g. air, water, glass etc.c.
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Materials through which lighht can propagate partially are known as translucent
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Materials through which light cannot propagate are known as opaque materials.
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F o r e . g . w a l l , w o o d , s t o n e e t
For e.g. wall, wood, stone etc.c.

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Rectilinear propagation of light..
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The property of light that it travels in a straight line is known ass rectilinear

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propagation of light.

A narrow group of light rays considered as a beam.
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 In a beam of light from a small source, the rays are moving away from each
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other. Such rays are called divergent rays.

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 In a beam of light from a very large source which is located far away, the rays of

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light is taken as parallell to each other.

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 When rays of light meet at a common point, they are called convergent rays.
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