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Question

Assertion :The focal length of objective lens in telescope is much more than that of eye piece. Reason: Telescope has high resolving power due to large focal length.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Focal length of objective of telescope is much more than eyepiece to capture maximum light. 
For telescope, 
Resolution, $$R=\lambda/D$$ 
Since, radius is large, $$D$$ is large and resolution is small. This means that telescope has high resolving power. 

Physics
NCERT
Standard XII

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