/-/https/www.sciencebuddies.org/cdn/Files/21464/5/sb-logo.png){kind=logo}
/-/https/www.sciencebuddies.org/cdn/Files/21464/5/sb-logo.png){kind=logo}
Image Credit
/-/https/www.sciencebuddies.org/cdn/Files/14241/6/v-shape-in-black-box.jpg)
Description:
Top view of the opened-up test box. The V shape stands in the box with the dip in the V facing the light. The dip rests on a small mark made on the bottom of the box
Source:
Science Buddies
License:
Science Buddies
/-/https/img.youtube.com/vi/YZ0SOAFXVAQ/0.jpg)
/-/https/img.youtube.com/vi/xf4Bnm8edAg/0.jpg)
/-/https/img.youtube.com/vi/dk4Bg0dV5-w/0.jpg)