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प्रश्न
Suggest one way, in each case, by which we can detect the presence of Infrared radiations.
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उत्तर
These are detected by a thermopile.
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
How could you show that the colours of the spectrum combine to give white light?
What are the seven colours seen in a rainbow?
A beam of white light is shone onto a glass prism. The light cannot be:
(a) deviated
(b) dispersed
(c) focused
(d) refracted
The colour of white light which suffers the maximum bending (or maximum refraction) on passing through a glass prism is:
(a) yellow
(b) orange
(c) red
(d) violet
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.
Write the range of wavelength of the visible spectrum.
Say TRUE or FALSE
Rainbow is formed by dispersion of which light by water drops
Why do we see a rainbow in the sky only after rainfall?
Assertion: We can see the rainbow in the sky when the rain starts falling after a spell of bright sunlight.
Reason: The rainbow is formed due to the dispersion of light.
