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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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- A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m².
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Zenor breakdown in a semiconductor diode occurs when
- A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m².
- In which of the processes, does the internal energy of the system remain constant?
- A force of 10N is applied on a body for 3 sec and the corresponding displacement 6 m.
- The ratio of the dimensions of planck’s constant and that of the moment of inertia is
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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