CUET · PHYSICS · PYQ PAPER 2025
A needle of length 4.5 cm is placed vertically 12 cm away from a convex mirror of focal length 15 cm. The magnification of the image produced is
- A \(-5/90\)
- B \(5/9\)
- C \(20/9\)
- D \(10/9\)
Answer & Solution
Correct Answer
(B) \(5/9\)
Step-by-step Solution
Detailed explanation
\(\frac{1}{f} = \frac{1}{v} + \frac{1}{u}\) \(\frac{1}{15} = \frac{1}{v} + \frac{1}{-12}\) \(\frac{1}{v} = \frac{1}{15} + \frac{1}{12} = \frac{4+5}{60} = \frac{9}{60}\) \(v = \frac{60}{9} = \frac{20}{3}\) cm \(m = -\frac{v}{u}\) \(m = -\frac{(20/3)}{(-12)} = \frac{20}{36}\)…
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