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प्रश्न
What is spectrum? What is the name of glass shape used to produce a spectrum?
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उत्तर
A spectrum is a band of seven colours produced when a beam of white light is passed through a transparent glass prism. To produce a spectrum of white light, a triangular glass prism is used.
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संबंधित प्रश्न
Study the following figure in which a student has marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e), angle of prism (∠A) and the angle of deviation (∠D). The correctly marked angles are
(a) ∠A and ∠i
(b) ∠A, ∠i and ∠r
(c) ∠A, ∠i, ∠e and ∠D
(d) ∠A, ∠i, ∠r and ∠D
What happens when a ray of ordinary light is passed through a triangular glass prism?
Make two diagrams to explain refraction and dispersion.
Which is refracted most by a prism : red light or violet light? Explain why?
Which of the following colour of white light is least deviated by the prism?
(a) green
(b) violet
(c) indigo
(d) yellow
Why do you not see a spectrum of colours when light passes through a flat pane of glass?
The splitting of white light into its constituent colours is called .............
A ray of light moving from an optically rarer to a denser medium
A ray of white light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.
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.
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
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.
State two properties of ultra-violet radiations which differ from visible light.
Write the range of wavelength of the ultraviolet spectrum.
The process of separation of light into its component colours while passing through a medium is called _______.
Observe the given figure and answer the following questions.
- Which colour light rays bend most?
- Which colour light rays bend least.
- What is the wavelength of violet light rays?
Say TRUE or FALSE
Rainbow is formed by dispersion of which light by water drops
Why do we see a rainbow in the sky only after rainfall?
Which one of the following is involved for the formation of rainbow in the sky?
