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प्रश्न
What is Newton’s disc?
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उत्तर
Newton Disc is a cardboard disc with seven equal sectors colored red, yellow, orange, green, blue, indigo, and violet. When the disc is turned quickly, the retina receives the sensation of the spectrum simultaneously and the disc appears white.
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संबंधित प्रश्न
Draw a ray diagram to explain the term angle of deviation.
When a ray of light enters a prism, it bends ______ the normal; as it leaves the prism, it bends ______ the normal.
In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen.
- State the colour seen
- at X, and
- at Y.
- Why do different colours of white light bend through different angles with respect to the incident beam of light?
Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark
(i) incident ray
(ii) emergent ray, and
(iii) angle of deviation.
How does the speed of light determine the optical density of a medium?
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
If white light is used in same way what change is expected in the emergent beam?
The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?
In the diagram, a narrow beam of white light is incident on a right-angled isosceles prism. The critical angle of the material of prism for the yellow colour of white light is 45°. Complete the diagram to show the path of blue, yellow, and red colours of white light till they emerge out of the prism.
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
