Question

The rays of different colours fail to converge at a point after going through a converging lens. This defect is called
(a) spherical aberration
(b) distortion
(c) coma
(d) chromatic aberration.

Answer 1

Answer:

The rays of different colours fail to converge at a point after going through a converging lens. This defect is called

(a) spherical aberration

(b) distortion✔

(c) coma

(d) chromatic aberration.

Answer 2

The rays of different colours fail to converge at a point after going through a converging lens. This defect is called chromatic aberration

Explanation:

Option (d) is correct.

• 'When rays of light of various colours, after passing via a converging lens, don't converge around the same point, it is known as chromatic aberration.
• This is because a lens has unique refractive indices for various colors, i.e. for different light wavelengths.

Refractive index:- Refractive index, commonly called refraction index, evaluate the stretching of a ray of light as it travels from one source to another. Furthermore, the refractive index is equivalent to the light velocity c of a specified wavelength in empty space separated into a material by its velocity v, or n = c / v.

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