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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 7 (3 MCQs)

Quiz Instructions

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1. A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. The size of image is approximately equal to

Correct Answer: A) B ((u-f)/f)1/2.

2. What is the formula for the mirror equation derived in the text?

Correct Answer: A) 1/v + 1/u = 1/f.

3. The magnifying power of an astronomical telescope in the normal adjustment position is 100. The distance between objective & the eyepiece is 101cm. What is the focal length of objective?

Correct Answer: A) 100cm.

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