MHT CET · Physics · Ray Optics
The image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from \(25 / 3 \mathrm{~m}\) to \(50 / 7 \mathrm{~m}\) in 30 second. The speed of the object in \(\mathrm{km} / \mathrm{hr}\) is
- A 5
- B 2.5
- C 4
- D 3
Answer & Solution
Correct Answer
(D) 3
Step-by-step Solution
Detailed explanation
\(f = R/2 = 20/2 = 10 \mathrm{~m}\) \(1/u_1 = 1/f - 1/v_1 = 1/10 - 1/(25/3) = 1/10 - 3/25 = (5-6)/50 = -1/50\)
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