Basic Refraction question. Kindly help

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The discussion revolves around a physics problem involving refraction, where a fisherman observes a rock at the bottom of a 20 cm deep stream. The key focus is on determining how deep the stream appears to the fisherman, using the index of refraction of water, which is 1.33. Participants discuss the application of the normal angle equation and the concept of apparent depth in relation to refractive index. One user expresses difficulty in applying the formula but seeks clarification on the underlying concepts. The conversation emphasizes understanding the theory behind refraction to solve the problem effectively.
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Homework Statement



A fisherman in a stream 20 cm deep looks downward into the water of stream
and sees a rock on the stream bed.
How deep does the stream appear to the fisherman?

Homework Equations


We Assume that the index of refraction of the water is 1.33.


The Attempt at a Solution


I am not able to apply the normal angle equation here..nuts !
 
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Kindly let me know the formula concept and i will calculate myself. I am really not getting it.
Thanks in advance
 
The formula is derived according to the following theory.
It's a method for measuring refractive index using apparent depth, but you can apply it to your problem quite easily.
RefIndex-1.jpg
 
Thanks mate. You really explained me the concept behind it too
Thanks once again. yoyo !
 
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