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प्रश्न
Make a rainbow
Try to make your own rainbow. You can try this project in the morning or in the evening. Stand with your back towards the Sun. Take a hosepipe or a water pipe used in the garden. Make a fine spray in front of you. You can see different colours of rainbow in the spray.
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उत्तर
Make a Rainbow
Materials:
- Hosepipe or garden water pipe
- A sunny day (morning or evening is ideal)
Procedure:
- Stand with your back towards the Sun.
- Hold the hosepipe or garden water pipe in front of you.
- Turn on the water and create a fine spray by partially covering the nozzle with your thumb.
Observation:
- You will see different colours of the rainbow forming in the spray of water.
Explanation:
- When sunlight passes through the water droplets in the spray, it gets refracted, reflected, and dispersed.
- This process splits the sunlight into its constituent colours, forming a spectrum that appears as a rainbow.
Conclusion:
- By using a hosepipe to create a fine spray of water with the Sun behind you, you can observe the formation of a rainbow. This demonstrates the principles of refraction, reflection, and dispersion of light.
संबंधित प्रश्न
Define the term dispersion of white light.
As light rays pass from air into a glass prism, are they refracted towards or away from the normal?
In the formation of spectrum of white light by a prism:
which colour is deviated least?
In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen.
Why do different colours of white light bend through different angles with respect to the incident beam of light?
The splitting up of white light into seven colours on passing through a glass prism is called:
(a) refraction
(b) deflection
(c) dispersion
(d) scattering
A ray of white light is passed through a glass prism and a spectrum is obtained on a screen.
- Name the seven colours of the spectrum in order.
- Do the colours have the same width in the spectrum?
- Which of the colour of the spectrum of white light deviates (i) the most, (ii) the least?
When a white light ray falls on a prism, the ray at its first surface suffers ______.
State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in the following figure.
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
Observe the given diagram and answer the questions:
- Name the process shown in the figure.
- Name the colour that deviates the most.
- Name the colour that deviates the least.
- Name any one phenomenon in nature which is based on the above process.
- Define ‘spectrum’.
