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NEET UG PHYSICS MCQ: RAY OPTICS
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A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The
magnifying power of telescope for viewing a distant object is:
magnifying power of telescope for viewing a distant object is:
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Correct option: A
28
Option A (28) is correct because the magnifying power of a telescope is the ratio of the focal length of the objective to the focal length of the eyepiece.
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Statement-A: The minimum distance between an object and its real image formed by a convex lens is .
Statement-B: The distance between an object and its real image is minimum when its magnification is -1. Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason: The focal length of a convex mirror is always taken negative. If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to
Statement-B: The distance between an object and its real image is minimum when its magnification is -1. Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason: The focal length of a convex mirror is always taken negative. If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to