In Young's double slit experiment, the fringe spacing increases if
Correct answer: C. the screen is moved further away
- A. the slit separation is increased
- B. the wavelength is decreased
- C. the screen is moved further away
- D. the slits are made narrower only
Explanation
Fringe spacing is the wavelength multiplied by the screen distance divided by the slit separation, so a more distant screen or a longer wavelength widens the fringes while a larger slit separation narrows them. This is why red fringes are wider than blue ones in the same apparatus. The experiment is the classic demonstration of the wave nature of light.
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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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