Question

Two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C) and (D) as given below.
Assertion (A): In a reflecting telescope, the image does not have chromatic aberration.
Reason (R): Chromatic aberration occurs only due to refraction of light through an optical medium.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Both Assertion (A) and Reason (R) are false.

Hint:

Chromatic aberration is caused by dispersion in lenses. Reflecting telescopes use mirrors — which don’t disperse light — so they avoid chromatic aberration completely.

Answer 1

The Correct Option is A

Assertion (A) is true: Reflecting telescopes produce images via mirrors, not lenses. Because mirrors reflect all light wavelengths uniformly, chromatic aberration is absent.Reason (R) is also true: Chromatic aberration occurs when a lens (optical medium) refracts (bends) different wavelengths of light unequally due to variations in their refractive indices.As reflecting telescopes utilize reflection rather than refraction, they are unaffected by chromatic aberration. Consequently, the reason accurately justifies the assertion.