Optics: Light, Reflection, Refraction, and Optical Instruments
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Free Physics Q & A Practice 1 of 5 free exam-style exercises in this topic
A glass block \(9\text{ cm}\) thick (refractive index \(\tfrac32\)) lies at the bottom of a tank, and water (refractive index \(\tfrac43\)) is poured over it to a depth of \(12\text{ cm}\). A mark \(X\) on the underside of the glass block is viewed from directly above (near-normal incidence).

water, n = 4/3 glass, n = 3/2 mark X 12 cm 9 cm viewed from directly above


By how much does the mark appear to be raised?
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