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प्रश्न
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’.
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उत्तर
- The process shown in the figure is the dispersion of light.
- The colour that deviates the most is violet.
- The colour that deviates the least is red.
- One phenomenon in nature based on the above process is the formation of a rainbow.
- A spectrum is a band of colours, as seen in a rainbow, produced by the separation of the components of light by their different degrees of refraction according to wavelength.
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संबंधित प्रश्न
In the following ray diagram the correctly marked angle are:
(a) ∠i and ∠e
(b) ∠A and ∠D
(c) ∠i, ∠e and ∠D
(d) ∠r, ∠A and ∠D
State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
A beam of white light is shone onto a glass prism. The light cannot be:
(a) deviated
(b) dispersed
(c) focused
(d) refracted
A ray of light moving from an optically rarer to a denser medium
The property of splitting of white light into its seven constituent colours is known as
The seven colours in the spectrum of sunlight in order, are represented as :
State the speed of light in (a) air, (b) water, and (c) glass
Define the term dispersion of light.
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?
The frequency range of visible light is from 3.75 × 1014 Hz to 7.5 × 1014 Hz. Calculate its wavelength range. Take speed of light = 3 × 108 m/s.
Refer to fig
(i) Name the lens L.
(ii) What are the points O, O' called?
(iii) Complete the diagram to form the image of the object AB.
(iv) Write three characteristics of the image.
Write the range of wavelength of the infrared spectrum.
Write an Explanation.
Critical angle
Draw a neat and labelled diagram for dispersion of light.
State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in the following figure.
Which one of the following is involved for the formation of rainbow in the sky?
During dispersion of white light by prism placed in air, for a particular value of angle of 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.
Which colour will show the maximum angle of deviation and which colour will show the minimum angle of deviation?
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?
