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Exam
NEET
Subject
Physics
Chapter
Ray Optics

NEET · Physics · Ray Optics

The graph shows how the magnification m produced by a thin lens...

The graph shows how the magnification mm produced by a thin lens varies with image distance vv. The focal length of the lens used is

The graph shows how the magnification m produced by a thin lens varies with image distance v . The focal length of the

Options

  1. Abc\dfrac{b}{c}
  2. Bac\dfrac{a}{c}
  3. Cb2ca\dfrac{{b}^{2}c}{a}
  4. Db2ac\dfrac{{b}^{2}}{ac}

Correct answer

A. bc\dfrac{b}{c}

Step-by-step solution

For a thin lens,
∣m∣=∣1−vf∣\left|m\right| = \left|1 - \dfrac{v}{f}\right|
From the above equation, slope of the line is 1f\dfrac{1}{f}
cb=1f\dfrac{c}{b} = \dfrac{1}{f}
f=bcf = \dfrac{b}{c}
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