TS EAMCET · Physics · Ray Optics
A straight metal rod of length 6 cm is placed along the principal axis of a concave mirror of focal length 9 cm such that the end of the rod closer to the mirror is at a distance of 15 cm from the pole of the mirror. The length of the image of the rod is
- A 6 cm
- B 12 cm
- C 8.75 cm
- D 6.75 cm
Answer & Solution
Correct Answer
(D) 6.75 cm
Step-by-step Solution
Detailed explanation
\(\frac{1}{v_1} = \frac{1}{f} - \frac{1}{u_1} = \frac{1}{-9} - \frac{1}{-15} = \frac{-5+3}{45}\) \(v_1 = -\frac{45}{2} = -22.5 \text{ cm}\) \(u_2 = u_1 - L = -15 - 6 = -21 \text{ cm}\)…
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