A glass block is immersed in a tank which is filled with a liquid of higher refractive index. Light is incident from the liquid on one side of glass block at an angle greater than critical angle. Which of the following statements are true?
Correct answer: D. Light is completely reflected back into the liquid
- A. Light is partially transmitted into the glass block bending towards the normal and partially reflected
- B. Light is partially transmitted into the glass block bending away from the normal and partially reflected
- C. Light is completely transmitted into the glass and did not reflect in to the liquid
- D. Light is completely reflected back into the liquid
Explanation
When light is being incident from a higher refractive medium to a lower refractive one at an angle of incidence greater than the critical angle, all of the light gets reflected into the same medium and none of it passes to the medium with a lower refractive index. This is known as Total Internal Reflection.
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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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