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Question
Suggest one way, in each case, by which we can detect the presence of Infrared radiations.
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Solution
These are detected by a thermopile.
RELATED QUESTIONS
Draw a ray diagram to explain the term angle of deviation.
The splitting up of white light into seven colours on passing through a glass prism is called:
(a) refraction
(b) deflection
(c) dispersion
(d) scattering
When a white light ray falls on a prism, the ray at its first surface suffers ______.
While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below. 
(A) I
(B) II
(C) III
(D) IV
An object is placed in front of a converging lens and in front of a diverging lens as in fig.
(a)Complete the ray diagram to obtain an image.
(b)Compare the nature of image formed by both the lenses in the above case.
The wavelength range of white light is ______.
Which characteristic property of light is responsible for the blue colour of the sky?
State two uses of ultraviolet radiation.
Write the range of wavelength of the infrared spectrum.
Say TRUE or FALSE
Rainbow is formed by dispersion of which light by water drops
