Fall 2019 Laws of Light PM-Assignment 1

This is Wenying Zhang's Assignment 1.

Group member:

Fan Yu 

Xiaoran Xu

Huiyu Wang

Wenying Zhang

Part 1

Wenying's blog link: https://wenying8812.blogspot.com/

Part 2

Use 3 identical 4x5 grey cards to make four photos of the cards with light source 2 ft, 4 ft, 8 ft, and 16 ft from the middle card. 

The following are the four photos.

Part 3

Use 3 4x5 cards a black card in front, a grey card in the middle and a white card in the back. Use one light source to make all 3 cards appear to be the same value.

We tried a lot of times to make all 3 cards appear to be the same value. 
The following three pictures show the process of our trials.
The last one is the most successful one, although it is not exactly the same.