CUET · PHYSICS · PYQ PAPER 2025
The focal length of the objective of a compound microscope is \( f_o \) and its distance from the eyepiece is L. An object is placed at a distance u from the objective. For proper working of the instrument
(A) L < u
(B) L > u
(C) \( f_o < L < 2f_o \)
(D) L > \( 2f_o \)
Choose the correct answer from the options given below:
- A (A) and (B) only
- B (B) and (D) only
- C (c) and (D) only
- D (B) and (C) only
Answer & Solution
Correct Answer
(B) (B) and (D) only
Step-by-step Solution
Detailed explanation
For magnified real image by objective: \( f_o \( \frac{1}{v_o} = \frac{1}{f_o} - \frac{1}{u} \implies v_o > 2f_o \) Tube length: \( L = v_o + f_e \) Thus, \( L > 2f_o \) (Condition D) Since \( L > 2f_o \) and \( u u \) (Condition B) The correct answer is (B) and (D) only.
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