State and explain the laws of refraction of light with the help of a labelled diagram.
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Laws of refraction, First law: According to the first law of refraction, the incident ray, the refracted ray and the normal at the point of incidence, all lie in the same. Second law: According to the second law of refraction, the ratio of the angle of incidence to the point of incidence, all lie in the same plane.
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Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.
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