Question 174 of 295
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called :
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Answer: (B) Chromatic aberration
Due to difference in refractive index of a material for different wavelengths, the focal length will be different for different colours. This will cause a separation of parallel beam of white light. This phenomenon is known as chromatic aberration.
Polarisation is a property applying to transverse waves that specify the geometrical orientation of the oscillations.
When energy waves (such as light, sound, and various electromagnetic waves) are caused to depart from a straight path due to imperfections in the medium it is called Scattering.
Spherical aberration is present when the outer parts of a lens do not bring light rays into the same focus as the central part.
