CUET · PHYSICS · PYQ PAPER 2025
The power and aperture of lenses L1, L2 and L3 are given below in tabular format. Which pair of lenses should be chosen for constructing a microscope?
| Lens | Power | Aperture |
| L1 | 3D | 8 cm |
| L2 | 6D | 1 cm |
| L3 | 10D | 1 cm |
- A L2 as eyepiece and L3 as objective
- B L3 as eyepiece and L2 as objective
- C L2 as eyepiece and L1 as objective
- D L1 as eyepiece and L2 as objective
Answer & Solution
Correct Answer
(A) L2 as eyepiece and L3 as objective
Step-by-step Solution
Detailed explanation
For a microscope, the objective lens requires high power and small aperture, while the eyepiece requires low power and large aperture. Objective L2: Power = \( 6D \), Aperture = \( 1 \text{ cm} \). Eyepiece L1: Power = \( 3D \), Aperture = \( 8 \text{ cm} \). This selection…
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