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An astronomical telescope has an objective lens having large focal length.

Assertion: An astronomical telescope has an objective lens having large focal length.

Reason: Magnifying power of an astronomical telescope varies directly with focal length of the objective lens.

• (a)Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
• (b)Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
• (c)Assertion is false and Reason is true.
• (d)Both Assertion and Reason are false.

Answer

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From ISC 2025 Specimen Physics Paper 1, question 1(A)(vi).