A fish in water (refractive index $n$) looks at a bird vertically above in the air. If $y$ is the height of the bird and $x$ is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is

Question

$x + y \cdot \left(1 - \frac{1}{n}\right)$

$x + ny$

$x + y \left(1 + \frac{1}{n}\right)$

$y + x \left(1 - \frac{1}{n}\right)$

Solution

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