STANDARD Physics Mirrors MCQ Question
An object 2 cm high is placed at a distance of 16 cm from a concave mirror, which produces a real image 3 cm high. What is the focal length of the mirror?
−9.6 cm
−3.6 cm
−6.3 cm
−8.3 cm
Correct Answer
Detailed Explanation
Using the mirror formula and magnification, we find the focal length. The magnification m = h₂/h₁ = -v/u = -3/2. Solving for v gives v = -24 cm. Using 1/f = 1/v + 1/u, we find f = -9.6 cm.
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