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प्रश्न
State two uses of ultraviolet radiation.
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उत्तर
(i) In producing vitamin D in plants.
(ii) For sterilizing purposes.
संबंधित प्रश्न
In the formation of spectrum of white light by a prism:
which colour is deviated most?
In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen.
State the colour seen (i) at X, and (ii) at Y.
Name the process which is involved in the formation of a rainbow.
Which of the following colour of white light is least deviated by the prism?
(a) green
(b) violet
(c) indigo
(d) yellow
In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.
In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray
(a) is parallel to the incident ray.
(b) is along the same direction of incident ray.
(c) gets deviated and bends towards the thinner part of the prism.
(d) gets deviated and bends towards the thicker part (base) of the prism.
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.
Draw a neat and labelled diagram for dispersion of light.
Make a rainbow
Try to make your own rainbow. You can try this project in the morning or in the evening. Stand with your back towards the Sun. Take a hosepipe or a water pipe used in the garden. Make a fine spray in front of you. You can see different colours of rainbow in the spray.
