The least distance of distinct vision for a normal eye is_______________?
Correct answer: B. 25 cm
- A. 15 cm
- B. 25 cm
- C. 30 cm
- D. 40 cm
Explanation
For a normal eye, the least distance of distinct vision is 25 cm, called the near point. At distances shorter than 25 cm, the eye cannot focus the image sharply on the retina. The common trap is 15 cm, which does not represent the standard near point of a normal adult eye.
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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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