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Questions
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?
A spectrum is produced on a screen when a ray of white light travels through a glass prism. What are the seven colours of the spectrum (in order)? Do these colours of light have the same width in the spectrum? Name the colour of the spectrum that deviates the most and the least.
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Solution
- Violet, Indigo, Blue, Green, Yellow, Orange, and Red.
- No, different colours have different widths in the spectrum.
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- The violet colour deviates the most.
- The red colour deviates the least.
RELATED QUESTIONS
State the cause of dispersion of white light
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.
- State the colour seen
- at X, and
- at Y.
- Why do different colours of white light bend through different angles with respect to the incident beam of light?
Which of the following coloured light has the least speed in glass prism?
(a) violet
(b) yellow
(c) red
(d) green
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
- A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
- If white light is used in the same way as in part (a) above, what change do you expect in the emergent beam?
- What conclusion do you draw about the nature of white light in part (b)?
Complete the ray diagram given below to show the nature of light produced on the screen.
Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it passes through a glass prism.
A wave has wavelength 50Å of name the wave.
Draw a neat and labelled diagram for dispersion of light.
