A convergent lens of 6 diopters is combined with a diverging lens of -2 diopters. Find the power of combination.
Correct answer: A. 4 diopter
- A. 4 diopter
- B. 6 diopter
- C. 8 diopter
- D. 10 diopter
Explanation
Lens powers add algebraically for thin lenses in contact: Ptotal= P1 + P2. Here, Ptotal = +6 D + (−2 D) = +4 D, so the combination is a converging system of power 4 D.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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