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प्रश्न
Write three conditions necessary to obtain a pure spectrum on a screen. Name the instrument in which the conditions stated by you are fulfilled.
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उत्तर
The three conditions necessary to obtain a pure spectrum on a screen are:
(i) A narrow parallel beam of light should be made incident on the prism.
(ii) The prism should be placed in the position of minimum deviation.
(iii) The emergent parallel beam should be focussed on the screen.
These conditions are fulfilled in the spectrometer.
संबंधित प्रश्न
Describe an activity to show that colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.
In the following diagram the correctly marked angles are :
(a) ∠A and ∠e
(b) ∠i, ∠A and ∠D
(c) ∠A ∠r and ∠e
(b) ∠A ∠r and ∠D
What happens when a ray of ordinary light is passed through a triangular glass prism?
A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is:
(a) violet
(b) red
(c) green
(d) blue
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
Why do you not see a spectrum of colours when light passes through a flat pane of glass?
A ray of white light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
Draw a labelled diagram: Dispersion of light through a prism.
What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
