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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
Study the following diagrams in which the path of a ray of light passing through a glass prism as traced by four students P, Q, R and S is shown:
The student who has traced the path correctly is
(A) P
(B) Q
(C) R
(D) S
The coloured light having the maximum speed in glass prism is ______.
What do you understand by the term spectrum?
When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labelled ray diagram to illustrate it.
Refer to fig
(i) Name the lens L.
(ii) What are the points O, O' called?
(iii) Complete the diagram to form the image of the object AB.
(iv) Write three characteristics of the image.
What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
Curved mirrors have surfaces that are spherical, cylindrical, parabolic, and ellipsoid.
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
When sunlight passes through water droplets in the atmosphere it gets dispersed into its constituent colours forming a rainbow. A similar phenomenon is observed when white light passes through a prism.
Which colour will show the maximum angle of deviation and which colour will show the minimum angle of deviation?
