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If the image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object, then the distance of the object from the mirror will be
Options
(a) 30 cm
(b) 60 cm
(c) 90 cm
(d) 120 cm
Correct Answer:
90 cm
Explanation:
Given, f = + 30 cm and m = 1 / 4 Magnification, m = f / (f – u)
Therefore, 30 / (30 – u) = 1 / 4
30 – u = 120
⇒ u = -90 cm
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A potentiometer wire of length 10 m and resistance 10 Ω per metre is connected in series
- When the wavelength of sound changes from 1 m to 1.01 m,
- An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
- A particle executing simple harmonic motion of amplitude 5 cm has maximum
- A galvanometer has a resistance 50Ω. A resistance of 5Ω is connected parallel to it.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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