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

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In summary, the problem asks for the apparent depth of an object 1.2m below the surface of a pool, given that a ray is leaving the object at 5 degrees to the normal and that the image is located on the normal. The relevant equations are 1/p+1/q=1/f and n1sintheta=n2sintheta2. The solution is 0.9m, and the suggested angle of 5 degrees is based on the fact that the result will be the same for any small angle as long as tan is approximately equal to sin. Simply drawing a ray will help in solving the problem.
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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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  • #2
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:
 

1. What is optics?

Optics is the branch of physics that deals with the study of light and its properties, including its behavior and interactions with matter.

2. How does light travel?

In optics, light is considered to travel in straight lines at a constant speed of approximately 299,792,458 meters per second in a vacuum. This is known as the speed of light.

3. What is the difference between reflection and refraction?

Reflection is the bouncing back of light when it hits a surface, while refraction is the bending of light as it passes through different mediums, such as air and water.

4. How are lenses used in optics?

Lenses are used in optics to manipulate and control the path of light. They can be converging (convex) or diverging (concave) and can either focus or spread out light rays.

5. What is the relationship between wavelength and frequency in optics?

In optics, the wavelength of light is inversely proportional to its frequency. This means that as the wavelength increases, the frequency decreases, and vice versa.

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