The least distance of distinct vision for a normal human eye is about
Correct answer: B. 25 cm
- A. 5 cm
- B. 25 cm
- C. 100 cm
- D. infinity
Explanation
About 25 cm is the closest an object can be brought while remaining in sharp focus without strain, and it is the reference distance used in the magnifying power formula for a lens. The near point recedes with age as the eye lens stiffens, which is why reading glasses are often needed after forty. The far point of a normal eye is at infinity.
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About Optics
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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