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The index of refraction (n) is defined as the speed of light in a material divided by the speed of light in vacuum.
True
Light travels faster in a vacuum than in a material medium.
False
When light enters from one medium into another, its direction of propagation remains unchanged.
False
The focal length of a thin lens is given by the formula f = (R1 * R2) / (R2 - R1), where R1 and R2 are the curvatures of the first and second surfaces.
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The combining focal length (fT) of two thin lenses with focal lengths f1 and f2 is given by 1/fT = 1/f1 + 1/f2.
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