CUET · PHYSICS · PYQ PAPER 2024

For an astronomical telescope with 10 m focal length objective and 10 cm eyepiece, tube length and magnification are:

A 20 cm, 1
B 1000 cm, 1
C 1010 cm, 1
D 1010 cm, 100

Verified Solution

Answer & Solution

Correct Answer

(D) 1010 cm, 100

Step-by-step Solution

Detailed explanation

\(L = f_o + f_e\) \(L = 1000 \text{ cm} + 10 \text{ cm} = 1010 \text{ cm}\) \(M = \frac{f_o}{f_e}\) \(M = \frac{1000 \text{ cm}}{10 \text{ cm}} = 100\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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