When light is incident normally on a thin film, the path difference depends upon
Correct answer: A. thickness of the film only
- A. thickness of the film only
- B. nature of the film only
- C. angle of incidence only
- D. all of thickness, nature, and angle of incidence
Explanation
When light is incident normally on a thin film, the path difference depends primarily on the thickness of the film. The formula for the path difference (Δd) is given by 2n⋅t, where n is the refractive index of the film and t is the thickness of the film.
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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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