Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of…
Physics · NEET · NTA Exams — Optics
Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of the combination is
- 4.5 D
- 18 D
- 45 D
- 9 D
Answer
(D) 9 D
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