TS EAMCET · Physics · Ray Optics
If the distances of the object and its real image from the principal focus of a concave mirror are 16 cm and 9 cm respectively, then the focal length of the mirror is
- A 30 cm
- B 12 cm
- C 18 cm
- D 24 cm
Answer & Solution
Correct Answer
(B) 12 cm
Step-by-step Solution
Detailed explanation
\( f^2 = x_1 x_2 \) \( f^2 = 16 \text{ cm} \times 9 \text{ cm} \) \( f^2 = 144 \text{ cm}^2 \) \( f = \sqrt{144 \text{ cm}^2} \) \( f = 12 \text{ cm} \)
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