KCET · Physics · Ray Optics
A Point object is moving uniformly towards the pole of a concave mirror of focal length \( 25 \mathrm{~cm} \)
along its axis as shown below. The speed of the object is \( 1 \mathrm{~ms}^{-1} \). At \( \mathrm{t}=0 \), the distance of the
object from the mirror is \( 50 \mathrm{~cm} \). The average velocity of theimage formed by the mirror
between time \( t=0 \) and \( t=0.25 \mathrm{~s} \) is
- A zero
- B \( 40 \mathrm{~cm} s^{-1} \)
- C infinity
- D \( 20 \mathrm{~cm} s^{-1} \)
Answer & Solution
Correct Answer
(C) infinity
Step-by-step Solution
Detailed explanation
Focal length \(=25 \mathrm{~cm}\)
\(U_{f}=25 \mathrm{~cm}\)
\(V_{f}=\infty\)
\( < \mathrm{V}>=\frac{V_{f}-V_{i}}{\Delta t}=\infty\)
\(U_{f}=25 \mathrm{~cm}\)
\(V_{f}=\infty\)
\( < \mathrm{V}>=\frac{V_{f}-V_{i}}{\Delta t}=\infty\)
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