Statement I: By increasing the diameter of the objective of…

Physics Ray Optics Statement Based MCQ (Single Correct)

Statement I: By increasing the diameter of the objective of telescope, we can increase its range.
Statement II: The range of telescope tells us how far away a star of some standard brightness can be spotted by telescope.
In the light of the above statements, choose the most appropriate answer from the options given below.

Both Statement I and Statement II are incorrect.

Statement I is correct but Statement II is incorrect.

Statement I is incorrect but Statement II is correct.

Both Statement I and Statement II are correct.

Text Solution

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The correct answer is:

Both Statement I and Statement II are correct.

The light gathering power (or brightness) of a telescope is directly proportional to the area of the objective lens.
Light gathering power , where D is the diameter of the objective.
So, by increasing the objective diameter even far off stars may produce images of optimum brightness.

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