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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Physics
Chapter
Ray Optics

AIIMS 2019 · 26 May · Physics · Ray Optics

A spherical mirror forms an image of magnification 3. The object...

A spherical mirror forms an image of magnification 3. The object distance, if focal length of mirror is 24 cm24 \mathrm{~cm}, may be

Options

  1. A32 cm,24 cm32 \mathrm{~cm}, 24 \mathrm{~cm}
  2. B32 cm,16 cm32 \mathrm{~cm}, 16 \mathrm{~cm}
  3. C32 cm32 \mathrm{~cm} only
  4. D16 cm16 \mathrm{~cm} only

Correct answer

B. 32 cm,16 cm32 \mathrm{~cm}, 16 \mathrm{~cm}

Step-by-step solution

m=ff−um=\frac{f}{f-u} If m=+3m=+3, then 3=−24−24−u3=\frac{-24}{-24-u} or −24−u=−8-24-u=-8 or u+24=8u+24=8 or u=8−24 cm=−16 cmu=8-24 \mathrm{~cm}=-16 \mathrm{~cm} If m=−3m=-3, then −3=−24−24−u-3=\frac{-24}{-24-u} u+24=−8u+24=-8 or u=−32 cmu=-32 \mathrm{~cm}
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