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प्रश्न
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उत्तर
A prism itself produces no colour. This can be demonstrated by the following experiment.
Experiment: In figure below, white light from a slit s is made to pass through a prism P which forms the spectrum VR on a while screen AB. A narrow slit H is made on the screen AB parallel to the slit S to allow the light of a particular colour to pass through it. This light of a particular colour is made to fall on a seconf prism Q placed with its base in opposite directionj to that of the prism P. The light after passing through the second prism Q is recieved on another white screen M.
It is observed that the colour of light onbtained on the screen M is sames as that of the light incident on the second prism Q through the slit H. If green light is incident on the prism Q, the screen M has only green colour. This proves that the prism itself produces no coours.
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संबंधित प्रश्न
What is a spectrum?
State the dependence of angle of deviation on the refractive index of the material of the prism.
Draw a ray diagram showing the lateral displacement of a ray of light when it passes through a parallel sided glass slab.
Name the phenomenon responsible in the following case:
Apparent bending of a stick in water
What should be the ratio of the speed of light through the liquid to the speed through the glass so that there is no refraction of light at the boundaries of the glass block when the system is illuminated by the light of one colour?
The diagram shows the path of a ray of light through a rectangular glass block placed in a liquid of uniform density.
Show with the help of a ray diagram the path of the ray when incident ray normally falls on the first surface of the glass block and passes through the block and the liquid.
Draw a diagram of a prism and label:
(i) the base,
(ii) the refracting surfaces,
(iii) the refracting edge,
(iv) the refracting angle in it.
