Geometrical optics — reflection, refraction, lenses, prisms; wave optics — Huygens' principle, interference (Young's double slit), diffraction (single slit), polarisation.
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Q1 · Optics · HARD
In a Young's double slit experiment, the slits are separated by 0.5 mm and the screen is 2 m away. When a thin glass plate of thickness 0.01 mm and refractive index 1.5 is placed in front of one slit, the central bright fringe shifts by a distance equal to the width of 5 fringes. The wavelength of light used is:
Q2 · Optics · MEDIUM
In a Young's double slit experiment, the slits are separated by 0.5 mm and the screen is placed 2 m away. If light of wavelength 600 nm is used, the distance between the 3rd bright fringe on one side and the 5th bright fringe on the other side of the central maximum is: