How many times will a light ray undergo retractionis obliquely incident on a rectangular glass slabt ?
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Through a glass slab, the light before coming back to the air suffers refraction two times. At the second time, the refracted ray bends away from the normal. If the light is incident at right angles then it will pàss through the glass slab without any deviation.
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Through a glass slab, the light before coming back to the air suffers refraction two times. At the second time, the refracted ray bends away from the....
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