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# System prepended metadata

title: Multimodal Interaction - Homework 3 - <br>Group 60

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# Multimodal Interaction - Homework 3 - <br>Group 60


## :memo: Q1: What is the Optical Principal of refraction? Write a short text (Max. 1/3 Page).
The Optical Principal of refraction is how to visually same objects in different positions in an image with combination of lines, gray shapes etc. to make them appear different about dimension, distance, color as in real life. In the following examples the square, the rectangle and the horizontal line  have exactly same size and color, but they seem different in the image because of optical principal of refraction.
![](https://i.imgur.com/qbHEHgs.png)

## :memo: Q2: Label the optics of the eye from the picture. Please find the picture of the eye with empty fields you need to fill in the attachment. 
![](https://i.imgur.com/H8amFdm.png)

## :memo: Q3: What are the benefits of eye muscle movements? 
Eye muscles facilitate eye movements. The muscles, when contracting, cause movement of the eyeball,  slightly rotate the pupil, narrow and widen the pupil and make the eye roll. With that humans can look and observe the objects in different positions and distances and also track moving objects.
## :memo: Q4: List one benefit of: 
* Fixation via saccades: It helps while reading by following approximately the lines and the line breaks.
* Convergence: To focus on nearby objects.
* Slow pursuit: Allowing us to keep a moving target in our field of view and clearly visualize it.
* Fast phases: It makes us able to recognize movements by representing consecutive images with highly frequency (rate) on a display. 

## :memo: Q5: List the two types of photochemical receptors. Which one is highly light sensitive? Which one is less light sensitive? 

        - Rods: very light sensitive.
        - Cones: less light sensitive, sensitive only to direct light.
