Solve this question: The refractive index of one medium is 2½ and of another medium is 2. If a light ray enters the second medium from the first medium with ann angle of incidence 45°, then find the angle of refraction of the light ray.
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- Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. ... An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
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