A thing that emits its own light is___________________?
Correct answer: A. luminous
- A. luminous
- B. non-luminous
- C. incandescent
- D. bright
Explanation
A luminous object produces and emits its own light, whereas a non-luminous object is visible only because it reflects light from another source. The likely wrong choice is c, incandescent, because an incandescent object emits light due to high temperature, but not every self-luminous source is necessarily incandescent.
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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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