CUET · PHYSICS · PYQ PAPER 2025
An object of length 2.0 cm is placed at a distance of 1.5 f from a concave mirror where f is the magnitude of the focal length of the mirror. The length of the object is perpendicular to the principal axis. The length of the image will be
- A \(4.0 cm\)
- B \(-4.0 cm\)
- C \(2.0 cm\)
- D \(-2.0 cm\)
Answer & Solution
Correct Answer
(B) \(-4.0 cm\)
Step-by-step Solution
Detailed explanation
\(\frac{1}{v} = \frac{1}{F} - \frac{1}{u} = \frac{1}{-f} - \frac{1}{-1.5f} = \frac{1}{f}(\frac{1}{1.5} - 1) = \frac{1}{f}(\frac{2}{3} - 1) = -\frac{1}{3f}\) \(v = -3f\) \(m = -\frac{v}{u} = -\frac{-3f}{-1.5f} = -2\)…
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