Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: The resolving power of a telescope is more if the diameter of the objective lens is more. Reason: Objective lens of large diameter collects more light.A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true but reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
Correct Answer: A
Solution :
Telescope is an optical instrument used to see distant objects. The image of the distance object formed by the telescope subtends a large visual angle at the eye, so that the object appears large to the eye. The objective consists of an achromatic convex lens of large focal length and large aperture. Aperture is taken large so that it may collect sufficient light and form bright image of very distant objects stars etc. Note: Eyepiece of small aperture is taken so that the whole light may enter the eye.
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