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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.
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संबंधित प्रश्न
Describe how you could demonstrate that white light is composed of a number of colours.
The coloured light having the maximum speed in glass prism is:
(a) blue
(b) green
(c) violet
(d) yellow
Out of the following, the colour of light having the maximum wavelength is:
(a) violet
(b) indigo
(c) green
(d) orange
In the following diagram, the correctly marked angles are
(A) All
(B) Only ∠i and ∠A
(C) ∠i, ∠r and ∠A
(D) ∠i, ∠A and ∠D
While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below. 
(A) I
(B) II
(C) III
(D) IV
Differentiate between a glass slab and a glass prism.
A student has to trace the path of a ray of light through a glass prism. List four precautions he should observe for better results.
In the diagram, a narrow beam of white light is incident on a right-angled isosceles prism. The critical angle of the material of prism for the yellow colour of white light is 45°. Complete the diagram to show the path of blue, yellow, and red colours of white light till they emerge out of the prism.
When sunlight passes through water droplets in the atmosphere it gets dispersed into its constituent colours forming a rainbow. A similar phenomenon is observed when white light passes through a prism.
Instead of sunlight, a green-coloured ray is passed through a glass prism. What will be the colour of the emergent ray?
