Assertion :The focal length of the objective in a telescope is larger than that of eyepiece. Reason: Magnifying power of telescope increases when the aperture is large

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
The focal length of the objective in a telescope is larger than that of eyepiece.The objective is a convex lens of large focal length and large aperture. It usually made of two convex lenses in contact with each other to reduce the chromatic and spherical aberrations.The eye piece is also a convex lens .Its focal length is smaller than that of objective. It is also a combination of two lenses.
Magnifying power of telescope increases when the aperture of the objective is large.

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