Question: A tank whose bottom is a mirror is filled with water to a depth of 20.0cm. A small fish floats motionless 7.0cm under the surface

A tank whose bottom is a mirror is filled with water to a depth of 20.0cm. A small fish floats motionless 7.0cm under the surface of the water.
(a) What is the apparent depth of the fish when viewed at normal incidence?
(b) What is the apparent depth of the image of the fish when viewed at normal incidence?

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