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10 questions
We need _________ to see the things around us.
All the sources of light can be classified into ____ categories.
An object that gives out its own light is called ________
We can see the moon because it reflects _______ into our eyes.
Light travels in _________ lines.
The property of light by which it travels in straight lines is called. _________ propagation of light.
An ______ substance on which shadow is formed called a screen.
Shadow is formed in the direction ________ to the source of light.
The shape and size of the shadow varies with the ________ of the source of light.
________ eclipse occurs when the sun, the moon and the earth come in a straight line.
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