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Q.A ray of light traveling in air strikes the surface of mineral oil at an angle of 23° with the normal to the surface. If the light travels at 2.17 multiplied by 108 m/s through the oil, what is the angle of refraction? (Hint: Remember the definition of the index of refraction.)

Q. A cylindrical container 1.0 m tall contains mercury to a certain depth,d . The rest of the cylinder is filled with water. If the pressure at the bottom of the cylinder is two atmospheres, what is the depth d?

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