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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.
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
Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark
(i) incident ray
(ii) emergent ray, and
(iii) angle of deviation.
The colour of white light which is deviated the maximum on passing through the glass prism is:
(a) blue
(b) indigo
(c) red
(d) orange
What do you understand by the term spectrum? Name the various colours present in the spectrum of sunlight.
The diagram below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. If the yellow light is replaced by a narrow beam of white light incident at the same angle, draw another diagram to show the passage of white light through the prism and label it to show the effect of prism on the white light.
What is the cause of the dispersion of white light through a glass prism? Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in an inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the faces of the prisms.
State two properties of ultra-violet radiations which differ from visible light.
The splitting of white light into its component colours is called ____________.
The periscope is an optical device with a polished surface that reflects the light falling on it.
A prism of refractive index `sqrt2` and refracting angle A produces minimum deviation δm of a ray on one face at an angle of incidence 45°, The values of A and δm are, respectively ______.
