STANDARDPhysics-Ray Optics
STANDARD Physics Mirrors MCQ Question
Type: MCQ-numerical-Medium-Class 12
When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10 cm. If the object is moved with a speed of 9 m s⁻¹, the speed with which image moves is
A
10 m s⁻¹
B
1 m s⁻¹
C
9 m s⁻¹
D
0.3 m s⁻¹
Correct Answer
Option B
Detailed Explanation
Using the mirror formula and differentiating with respect to time, we find the speed of the image. The formula gives vᵢ = (v²/u²) * vₒ. Substituting the values, vᵢ = 1 m s⁻¹.
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