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प्रश्न
Which of the following colour of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue
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उत्तर
Violet
Violet is the colour of white light that has the least wavelength.
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संबंधित प्रश्न
The path of a ray of light passing through a glass prism is shown below:
In this diagram, the angle of prism, angle of incidence, angle of emergence and angle of deviation, respectively, have been represented by:
(A) O, Y, Z and N,
(B) P, Y, M and Z,
(C) O, X, M and Z,
(D) P, X, Z and N.
Draw a ray diagram to explain the term angle of deviation.
What is spectrum? What is the name of glass shape used to produce a spectrum?
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
Why do you not see a spectrum of colours when light passes through a flat pane of glass?
The property of splitting of white light into its seven constituent colours is known as
The seven colours in the spectrum of sunlight in order, are represented as :
The diagram below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. If the yellow light is replaced by a narrow beam of white light incident at the same angle, draw another diagram to show the passage of white light through the prism and label it to show the effect of prism on the white light.
When a white light ray falls on a prism, the ray at its first surface suffers ______.
In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray
(a) is parallel to the incident ray.
(b) is along the same direction of incident ray.
(c) gets deviated and bends towards the thinner part of the prism.
(d) gets deviated and bends towards the thicker part (base) of the prism.
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.
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.
State two properties of ultra-violet radiations which differ from visible light.
What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
Write the range of wavelength of the visible spectrum.
What is dispersion? Explain in detail.
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
Observe the given diagram and answer the questions:
- Name the process shown in the figure.
- Name the colour that deviates the most.
- Name the colour that deviates the least.
- Name any one phenomenon in nature which is based on the above process.
- Define ‘spectrum’.
