When white light falls on a glass prism, it splits into seven colours. The phenomena is known as:
dispersion
When white light passes through a glass prism, it splits into its constituent seven colors, typically seen as a spectrum ranging from red to violet. This phenomenon is called dispersion. Dispersion occurs because different colors of light have different wavelengths and, consequently, are refracted by varying amounts when passing through a medium like glass. This separation of light into colors results in the spectrum commonly associated with a rainbow.
- Deviation: Refers to the change in direction of light but does not specifically involve separation into different colors.
- Refraction: Is the bending of light as it passes from one medium to another, which is part of the process in dispersion but doesn’t account for the splitting into multiple colors on its own.
- Diffraction: Refers to the spreading of light as it encounters an obstacle or a slit, which is a different phenomenon from dispersion.
Thus, the correct answer is the second option: dispersion.
Similar Questions
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Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
The power of a lens is -2.5 D. The type of lens and its focal length are respectively:
