Lens Combination Power
Equivalent power of two thin lenses in contact P1 and P2?
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About This Question
- Subject
- physics
- Chapter
- optics
- Topic
- lens combination power
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
P1 + P2
- Reciprocal Focal Lengths: For two thin lenses of focal lengths f1 and f2 in contact, the equivalent focal length F is given by F1=f11+f21.
- Linking to Power: Since P=1/f, we can directly substitute the power terms.
- Addition Rule: The total power Peq is the algebraic sum of individual powers: Peq=P1+P2.
- Application: This allows us to create combinations with desired convergence or divergence levels by simply adding lenses.
- Sign Note: Converging lenses add positive values; diverging lenses add negative values.
This medium difficulty physics question is from the chapter optics, covering the topic of lens combination power. It appeared in the 2025 exam.
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