Advertisements
Advertisements
प्रश्न
Why do you not see a spectrum of colours when light passes through a flat pane of glass?
Advertisements
उत्तर
When light passes through a flat pane of glass, the refracted light emerges out of the glass pane without any deviation because a glass pane has two sides that are parallel to each other. As the emergent light does not deviate from the original direction by any angle, we do not see the different colours of the light separated out in the form of a spectrum. Therefore, in order to view a spectrum of colours, the incident rays have to fall on an object whose surfaces are not parallel, such as a glass prism (triangular shape).
APPEARS IN
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.
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are :
(A) ∠i and ∠r
(B) ∠i and ∠e
(C) ∠i, ∠e and ∠D
(D) ∠i, ∠r and ∠e
Draw a ray diagram to show the dispersion of white light.
What will happen if another similar glass prism is placed upside down behind the first prism?
Describe how you could demonstrate that white light is composed of a number of colours.
Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark
(i) incident ray
(ii) emergent ray, and
(iii) angle of deviation.
Which of the following colour of white light is least deviated by the prism?
(a) green
(b) violet
(c) indigo
(d) yellow
Which of the following coloured light has the least speed in glass prism?
(a) violet
(b) yellow
(c) red
(d) green
The property of splitting of white light into its seven constituent colours is known as
How does the speed of light determine the optical density of a medium?
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.
Explain the cause of dispersion of white light through a prism.
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?
The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?
State two uses of ultraviolet radiation.
Write an Explanation.
Critical angle
Say TRUE or FALSE
Rainbow is formed by dispersion of which light by water drops
When white light enters a glass prism from the air, the angle of deviation is least for ____________.
The phenomena of light involved in the formation of rainbow are ______.
