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