The optical path of monochromatic light is the same if it travel \(...

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The optical path of monochromatic light is the same if it travel \( 5 \mathrm{~cm} \) thickness of glass or \( 6.35 \mathrm{~cm} \)
\( \mathrm{P} \)
thickness of water. If the refractive index of water
W
is 1.33 , what is the refractive index of glass?
(1) 1.70
(2) 1.50
(3) 2.56
(4) 1.45
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