Learn how to solve optics questions with 5 degree ray angles | Homework Help

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Homework Statement


An object is 1.2m below the surface of a pool. By using a ray that leaves the object at 5 degrees to the normal, find the apparent depth of the object. Assume the image is located on the normal


Homework Equations



1/p+1/q=1/f

n1sintheta=n2sintheta2

The Attempt at a Solution



I have no idea how to approach this question all I need is a start then ill solve it.

The answer is 0.9m but I have no idea how to get there.
 

Discussion

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hi link107! :smile:

they suggest 5° because the result will be the same no matter what angle you choose, provided it's small enough so that tan is approximately the same as sin :wink:

so just draw a ray :smile:​