The critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is equal to:
Correct answer: D. 90˚
- A. 0˚
- B. Angle of incidence
- C. Twice the angle of incidence
- D. 90˚
Explanation
The critical angle is the angle of incidence to which the angle of refraction is equivalent to 90 ° . When light enters a denser media from such a comparably rarer medium, the orientation of light changes as well as the light beam bending towards the normal.
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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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