Created by StemPy LabIn a Young's double-slit experiment, the slits are apart. When the screen is moved closer to the slits, the fringe width decreases by . The wavelength of the light is
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← An optical fibre has a glass core of refractive index 1.50, surrounded by a cladding of refractive index 1.40, as shown in the figure. Light enters the flat end of the fibre from air. What is the largest angle with the fibre's axis at which a ray can enter and still be trapped inside the core by total internal reflection?The atomic masses are: hydrogen-1, 1.007825 u; neutron, 1.008665 u; helium-4, 4.002603 u. Take 1 u as equivalent to 931.5 MeV. The binding energy of the helium-4 nucleus, and its binding energy per nucleon, are closest to →
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