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Refraction at Planar Surface

Is the formul...

Question

Is the formula "Real depth/Apparent $depth = μ$ valid if viewed from a position quite away from the normal?

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Solution

No, because this formula is only valid when the angles of incidence and refraction are small. When the angles of incidence and refraction are large, we cannot use relations sini = tani and sinr = tanr to derive the formula for the apparent depth.

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