Which of the following phenomena happens because \( n \) varies wit...

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Which of the following phenomena happens because \( n \) varies with wavelength?
(A) A lens focuses light
\( \mathrm{P} \)
(B) A prism brakes sunlight into different colours
W
(C) Total internal reflection ensures that light travels down a fiber optic cable
(D) Light rays entering a pond change direction at the pond's surface
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