Following the instructions above, play the video and pause when the brightness from the bulb shining on the lower wax block is

Question

Following the instructions above, play the video and pause when the brightness from the bulb shining on the lower wax block is the same as the brightness of the sun's light on the upper block. Use the ruler tool to measure the distance from the bulb to the middle of the wax blocks. 
1. Play the video. Pause the video and move the scrub bar at the bottom of the video until the lower wax block and upper wax block appear to me the same color. 
2. Use the ruler to help you determine the r from the light source. (Remember to measure to the center of the blocks, which is where the two blocks meet). Your r should be where the distance away from the light source produces the same level of brightness on the top and bottom of the wax blocks.

Kunduz · Accepted Answer

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