CBSE 2025, Set 2

Question

**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.

Edvaya · Accepted Answer

The correct answer is Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).. **Step 1: Check Assertion (A)**
A reflecting telescope uses mirrors (typically a parabolic objective mirror) instead of lenses to gather and focus light. Because mirrors reflect light regardless of its wavelength, all colors focus at the same point, eliminating chromatic aberration. (Assertion is **True**).

**Step 2: Check Reason (R)**
Chromatic aberration is caused by dispersion, which is the dependence of the refractive index of a material on the wavelength of light. Thus, it only occurs during refraction (like through a lens), not during reflection. (Reason is **True**).

**Step 3: Check Explanation**
The reason correctly explains *why* the reflecting telescope (which relies on reflection, not refraction) is free from chromatic aberration.

Thus, both A and R are true, and R is the correct explanation of A.

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Physics > Optics > Ray Optics And Optical Instruments

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