Does the depth of tank of water appear to change or remain the same when viewed normally from above?

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Solution

The angle of refraction is zero, If the incident ray strikes at the glass slab at $0 °$ .
This is due to the fact that whenever the light strikes the medium at 0 degree, there is no change in the speed of the light there is no deviation or bending take place.
Hence the height/depth of the container will remain the same as viewed form above.

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