CUET · PHYSICS · PYQ PAPER 2023
Four lenses of focal length ±5 cm and ±200 cm are available for making a telescope. To produce the largest magnification for making a telescope with the help of these lenses, the focal length of eye piece should be :
- A + 200 cm
- B -5 cm
- C -200 cm
- D +5 cm
Answer & Solution
Correct Answer
(D) +5 cm
Step-by-step Solution
Detailed explanation
For largest magnification, \( |M| = \frac{|f_o|}{|f_e|} \) should be maximized. Choose largest \( |f_o| = 200 \text{ cm} \). Choose smallest \( |f_e| = 5 \text{ cm} \). For an astronomical telescope, the eyepiece is a converging lens. \(f_e = +5 \text{ cm}\)
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