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Semi conductors:
Semi conductors are these substances which lie among conductor and insulators.
Semi conductor is those substances which hardly pass electric current by them.
E.g. crystals of silicon and germanium.
Write down Gauss law in electrostatics. get its differential form in vacuum.
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Red light (λ = 685 nm) falls on a slit that is 0.025 mm wide. The distance between the centers of the central bright band and the second-order dark band is 6.3 cm. What is
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Sclera: It is an outer most, thick, impermeable to light. It is more convex and it's front part is transparent is known as Cornea.
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