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प्रश्न
Suggest one way, in each case, by which we can detect the presence of Infrared radiations.
उत्तर
These are detected by a thermopile.
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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
State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
Fill in the blank with suitable word:
When a ray of light enters a prism, it bends ................ the normal ; as it leaves the prism, it bends ................. the normal.
Name the process which is involved in the formation of a rainbow.
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
A ray of light moving from an optically rarer to a denser medium
The property of splitting of white light into its seven constituent colours is known as
When a white light ray falls on a prism, the ray at its first surface suffers ______.
If white light is used in same way what change is expected in the emergent beam?
What is dispersion? Explain in detail.
