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What is apparent and true dip

Asked by rpraveena06 21st September 2018, 7:36 PM
Answered by Expert
I assume this question is about light refraction.
As shown in figure, when light travels from one transparent medium (water), to another transparent medium (air)
refraction of light takes place. This means light deviates in its rectlinear path in another medium as shown in figure.
In this example water is optically denser medium compare to air. Hence the light ray deviates away from normal
at the boundary between two medium.
For example, light ray starting at O, which is at bottom most point in water column, is deviated at A and reaches observer at air.
Due to this deviation, it appears to the observer as if the light ray is coming from point C which is above the bottom surface.
The real depth BO is seen by the observer as apparent depth BC.
This real depth BO and apparent depth BC are related as,
apparent-depth / real-depth  = BC / BO = refractive-index-of-water
Answered by Expert 24th September 2018, 9:10 AM
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