CUET · PHYSICS · PYQ PAPER 2023
The optical length of an astronomical telescope with magnifying power of 10 for normal adjustment is 55 cm. What is the focal length of the objective ?
- A 5 cm
- B 50 cm
- C 55 cm
- D 550 cm
Answer & Solution
Correct Answer
(B) 50 cm
Step-by-step Solution
Detailed explanation
\(M = \frac{f_o}{f_e} \implies 10 = \frac{f_o}{f_e} \implies f_o = 10f_e \) \(L = f_o + f_e \) \(55 = 10f_e + f_e \) \(55 = 11f_e \implies f_e = 5 \text{ cm}\) \(f_o = 10 \times 5 = 50 \text{ cm}\)
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