A transparent sphere of radius 6ch is kept in air. An object is placed at 12 cm distance from the surface of the sphere and its real image is formed at the same distance from the second surface of the sphere. Find the refractive index of the material of the sphere ?
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The concept of time is self-evident. An hour consists of a certain number of minutes, a day of hours and a year of days. ... Time is represented through change, such as the circular motion of the moon around Earth. The passing of time is indeed closely connected to the concept of space.
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