A photon of light enters into a block of glass after traveling through a vacuum. The energy of the photon on entering the glass block
Correct answer: C. Remains the same
- A. Increases
- B. Decreases
- C. Remains the same
- D. None of these
Explanation
The energy of a photon is determined by its frequency, not by its speed. When a photon of light enters a denser medium like glass from a vacuum, its speed decreases, but its frequency remains unchanged. Since the energy of a photon is directly proportional to its frequency (E = hf), the energy of the photon remains the same when it enters the glass block. Options A and B are incorrect because they suggest changes in energy based on speed rather than frequency. Option D is incorrect because the correct answer is provided in Option C.
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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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