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Questions and Answers
The index of refraction (n) is defined as the speed of light in a material divided by the speed of light in vacuum.
The index of refraction (n) is defined as the speed of light in a material divided by the speed of light in vacuum.
True (A)
Light travels faster in a vacuum than in a material medium.
Light travels faster in a vacuum than in a material medium.
False (B)
When light enters from one medium into another, its direction of propagation remains unchanged.
When light enters from one medium into another, its direction of propagation remains unchanged.
False (B)
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.
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.
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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