Question

Chromatic aberration in a lens is caused by______.

• A. Dispersion
• B. Reflection
• C. Diffraction
• D. Interference

Answer 1

The correct option is A

Dispersion

The explanation for the correct option:

In the case of option ($\mathrm{A}$)

1. The failure of the lens to focus is known as chromatic aberration. It is caused by dispersion.
2. Dispersion refers to the splitting of white light into its constituent hues.
3. In our daily lives, here are some examples of dispersion: We see a rainbow in the sky after it rains, which is caused by sunlight dispersion.

The explanation for the incorrect option:

In the case of option ($\mathrm{B}$)

1. The rapid change in the propagation direction of a wave as it meets the boundary between two mediums is known as reflection.
2. At least a portion of the approaching wave disturbance stays in the same medium.

In the case of option ($\mathrm{C}$)

1. The spreading of waves around obstacles is known as diffraction.
2. Diffraction occurs with sound, electromagnetic radiation like light, $\mathrm{X}$-rays, and gamma rays, and very small moving particles like atoms, neutrons, and electrons that exhibit wave-like qualities.
3. Diffraction occurs when light passes through a thin opening in the blinds, generating dazzling and dark shadows and patterns to fall on the floor.

In the case of option ($\mathrm{D}$)

1. In physics, interference is the result of two or more wave trains traveling in opposite directions on intersecting or coinciding pathways.
2. The effect is the sum of the individual wave amplitudes at each site where more than one wave is present in the interference.
3. The light reflected from a coating of oil floating on water is one of the best instances of interference.

Therefore, option ($\mathrm{A}$) is the correct choice.