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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
In the following diagram, the path of a ray of light passing through a glass prism is shown:
In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option):
(A) X, R and T
(B) Y, Q and T
(C) X, Q and P
(D) Y, Q and P
A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:
What will happen if another similar glass prism is placed upside down behind the first prism?
Make two diagrams to explain refraction and dispersion.
The colour of white light which is deviated the maximum on passing through the glass prism is:
(a) blue
(b) indigo
(c) red
(d) orange
Which of the following coloured light has the least speed in glass prism?
(a) violet
(b) yellow
(c) red
(d) green
A wave has wavelength 50Å of name the wave.
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.
Write the range of wavelength of the visible spectrum.
The dispersive powers of flint glass and crown glass are 0.053 and 0.034, respectively and their mean refractive indices are 1.68 and 1.53 for white light. Calculate the angle of the flint glass prism required to form an achromatic combination with a crown glass prism of refracting angle 4°:
