Which is not optically active ?
Correct answer: C. water
- A. sugar
- B. tartaric acid
- C. water
- D. sodium chlorate
Explanation
Optical activity means rotating the plane of polarization of light, which is associated with chiral substances. Water has no such chiral molecular structure and does not rotate the plane of polarization, whereas sugar and tartaric acid are optically active. Students may choose sodium chlorate because its crystal properties can be optically complicated, but water is the standard answer here.
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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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