Photography
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9-6 and 9-9 Activity 
​The Pinhole and Eye Chart experiment.
Today's Power Point from class: 

Download The Eye and Camera Parts Show:

eye_parts_of_camera_pp_show.ppsx
File Size: 4231 kb
File Type: ppsx
Download File

Download The Eye and Camera Parts Show to PRINT:

eye_parts_of_camera_pp_pdf_to_print.pdf
File Size: 1079 kb
File Type: pdf
Download File

The chart below was  projected on the whiteboard for the class to conduct this visual experiment: Follow the instructions for the activity or get a handout that outlines the activity in class.   

Do Now: (this chart is displayed on the board but you could use almost anything-even a poster across a room).

1) Take off your glasses, look at the eye chart and answer, Which line on the chart can't you read? Write that down____
​Now cover one eye and then the other while looking at the chart and determine 
2) Which eye is your weaker eye? ________ (left or right)
​Use that eye for the experiment

Picture
use one of the eye charts in the room:
Using one eye, your eye with the poorest vision, cover your good eye and determine; determine the line you cannot read , use that line for the activity

Classroom Activity:
1) make a small pin-hole in the cardboard provided,
Then Using the weaker eye, look through the small pin-hole and look at the line you could not read

2)
What happened:  _________________________
(How has your vision changed looking through the small pin-hole?)
3) Why do you think your vision has changed?
___________________________________________
​

We will discuss our theories in class!
If you were absent for this experiment, come to extra help and we will do this together, or try it on your own and answer the questions above, then hand them in when you get back to class.


Our Conclusions:

Q:
​Why does smaller openings make an image sharper? 


A:
At a larger opening, the more light is let in, the more disorganized the light is, the blurrier the image. Also a smaller opening (aperture) reduces aberrations (irregularities in a lens) and extra reflections, which cause the image to appear soft  (unfocused) at a larger opening.

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