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प्रश्न
Answer the following:
What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.
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उत्तर
- The phenomenon of splitting of light into its component colours is called dispersion of light.
- In the spectrum of light splitting of white light into different colours takes place. Various colours obtained in spectrum of light are in the sequence - Violet, Indigo, Blue, Green, Yellow, Orange and red.
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संबंधित प्रश्न
Make two diagrams to explain refraction and dispersion.
What acts as tiny prisms in the formation of a rainbow?
What are the seven colours seen in a rainbow?
Which is optically denser: water or air? Give reason
In figure AO is the ray of white light falling on a prism PQR. Complete the diagram till the light emerges out from the prism and falls on the screen.
What do you understand by the term spectrum? Name the various colours present in the spectrum of sunlight.
What conclusion do you draw about the nature of white light in part (b)?
What do you understand by the term spectrum?
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?
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
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.
Draw a labelled diagram: Dispersion of light through a prism.
Differentiate between a glass slab and a glass prism.
Write three conditions necessary to obtain a pure spectrum on a screen. Name the instrument in which the conditions stated by you are fulfilled.
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| The wavelength of red light | (a) 600 nm |
| (b) 700 nm | |
| (c) 500 nm |
State the correct sequence (1-7) of colours in the spectrum formed by the prisms A and B, shown in the following figure.
What is Newton’s disc?
