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प्रश्न
Name three factors on which the deviation produced by a prism depends and state how does it depend on the factors stated by you.
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उत्तर
The following four factors affect the deviation the prism produces:
- The angle of incidence: As the angle of incidence increases, first the angle of deviation decreases and reaches a minimum value for a certain angle of incidence. By further increasing the angle of incidence, the angle of deviation is found to increase.
- The material of the prism (i.e., refractive index): for a given angle of incidence, the prism with a higher refractive index produces a greater deviation than the prism with a lower refractive index.
- Angle of prism: The angle of deviation increases with the increase in the angle of the prism.
- The colour or wavelength of light used increases the angle of deviation with a decrease in the wavelength of light.
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संबंधित प्रश्न
How does the deviation produced by a triangular prism depend on the colours (or wavelengths) of light incident on it?
In following diagram shows a thin beam of white light from a source S striking on one face of a prism.
A slit is placed in between the prism and the screen to pass only the light of green colour. What will you then observe on the screen?
In following diagram shows a thin beam of white light from a source S striking on one face of a prism.
What conclusion do you draw from the observation in part (b) above?
(i) Draw a diagram to show the splitting of white light by a prism into its constituent colour.
(ii) Draw another diagram to show how the colours of spectrum of white light can be combined
to give the effect of white light.
Write the approximate wavelengths for blue.
Give a reason, why the violet colour of white light deviated most and red colour of white light deviated least.
Name the radiation of a wavelength longer than 8 × 10−7 m.
Comment on the statement: ‘When any ray of white light is incident on a glass prism, it simply disperses it into its seven constituent colours.
The wavelengths for the light of red and blue colours are nearly 7·8 × 10-7 m and 4·8 × 10-7 m respectively.
Which colour has greater speed in glass?
