Explain and draw a diagram to show what happens to light when it enters oil kept in a
glass.
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An acute angle is an angle that measures less than 90 degrees. ... For example, in an equilateral triangle, all three angles measure 60˚, making it an acute triangle. Acute triangle. Dividing the right angle will give us two or more acute angles since each newly formed angle will be less than 90˚.
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Light travels at different speeds through different substances. This change in speeds causes light to refract (bend). When two substances have the same index of refraction, light passes through it at the exact same speed and our eyes cannot tell the difference between them.
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