What do you understand by the Statements
(i) Critical angle of the glass is 42°
(ii) Refractive index of the glass is 2.5
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critical angle of glass is 42 degrees means that any angle falling after this will be reflected back in to the medium. It's based on total internal reflection.
refractive index is the relative measure of optical density of the medium with that of air it means that light will move2.5 times slower than it actually does in air
refractive index is the relative measure of optical density of the medium with that of air it means that light will move2.5 times slower than it actually does in air
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