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

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To find the apparent depth of an object submerged 1.2m in a pool at a 5-degree angle to the normal, the relevant equations include the lens formula and Snell's law. The solution approach involves understanding that the angle does not significantly affect the outcome for small angles, allowing for simplifications using trigonometric approximations. The expected answer for the apparent depth is 0.9m. Visualizing the problem with a ray diagram can aid in understanding the refraction involved. A clear grasp of the basic principles of optics is essential for solving such problems effectively.
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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.
 
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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:​
 
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