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Light and its properties | Science Class 5 PDF Download

During photosynthesis, the green plants prepare food using the energy of sunlight. Light is, therefore, a form of energy. So, we can say that when we eat food, the energy we get is actually light energy stored in food!

Sources of Light

Something that gives off light is a source of light. Sources of light can be natural or artificial

Light and its properties | Science Class 5

  • The sun, stars and glow-worms are natural sources of light. 
  • The sun is our main source of light.
  • Candles and electric bulbs are artificial sources of light.

How are we able to see things?

When light from a source of light such as an electric bulb falls on a picture, a part of it is bounced off. When this bounced light falls on our eyes, we can see the picture. This bouncing off of light by objects is called reflection of light.

 Light and its properties | Science Class 5

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Properties of Light

1. Light Travels from One Place to Another

When we switch on the light in a dark room, at once the whole room is filled with light. The sunlight from the sun travels in all directions and reaches the earth, stars, and the moon. It shows that light spreads in all directions from its source, unless it is restricted by some barrier.

Light and its properties | Science Class 5 

2. Light Travels in Straight Lines 

Light travels in a straight line as thin beams of light called rays.  It cannot travel in the bent tube to reach our eye. The propagation of light in a straight line is known as rectilinear propagation of light.

Light and its properties | Science Class 5

3. Light is Made of Seven Colors 

You must have seen rainbow in the sky sometimes. It is usually seen after it rains. When sunlight passes through the raindrops, it gets separated into seven colours – violet, indigo, blue, green, yellow, orange and red. So, we can say that the white light that we get is actually made up of seven colours. We can also see rainbow in water drops of fountains or water sprinkler if sunlight falls on them at certain angle.

Light and its properties | Science Class 5

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FAQs on Light and its properties - Science Class 5

1. What are the sources of light?
Ans. The sources of light include natural sources like the sun, stars, and fire, as well as artificial sources like light bulbs, candles, and LED lights.
2. What are the properties of light?
Ans. Light has various properties, including reflection, refraction, dispersion, polarization, and interference.
3. How does light interact with different materials?
Ans. Light can be absorbed, transmitted, reflected, or refracted when it interacts with different materials, depending on the properties of the material.
4. How does light travel through different mediums?
Ans. Light can travel through mediums like air, water, glass, and other transparent materials at different speeds and may change direction when it enters a different medium.
5. How is light essential for life on Earth?
Ans. Light is crucial for photosynthesis in plants, vision in animals, and overall visibility and warmth on Earth, making it an essential element for sustaining life.
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