Power of a lens is one diopter if its focal length is
Correct answer: A. 1 meter
- A. 1 meter
- B. 2 meter
- C. ½ meter
- D. ¼ meter
Explanation
Lens power is P = 1/f, with P in dioptres and focal length f in metres. For P = 1 D, f = 1/1 D = 1 m, while 1/2 m would give P = 2 D and is the likely mistake.
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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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