Light
ICSE · Class 4 · Science
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What is light?
Answer
Light is a form of energy that helps us see things around us. Without light, we cannot see anything, even with our eyes open.
Name two natural sources of light.
Answer
Sun and stars are natural sources of light. They give out their own light without any human help.
Name two artificial sources of light.
Answer
Candle and electric bulb are artificial sources of light. These are made by humans to produce light.
What are luminous objects? Give two examples.
Answer
Luminous objects are those that give out their own light. Examples: Sun and burning candle.
What are non-luminous objects? Give two examples.
Answer
Non-luminous objects do not give out their own light. We see them when light from a source reflects off them. Examples: Book and chair.
Why can we see non-luminous objects?
Answer
We can see non-luminous objects because light from a source (like the Sun or bulb) falls on them and bounces back to our eyes. This bouncing back of light is called reflection.
What is reflection of light?
Answer
Reflection is when light bounces off a surface. For example, when light hits a book, it reflects and enters our eyes, so we can see the book.
How does light travel?
Answer
Light travels in straight lines. This is called rectilinear propagation of light. It moves as thin beams called rays.
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