B) herman von helmholtz
The trichromatic color theory<span> began in the 18th century, when </span>Thomas Young<span> proposed that color vision was a result of three different </span>photoreceptor cells<span>. </span>Hermann von Helmholtz<span> later expanded on Young's ideas using color-matching experiments which showed that people with normal vision needed three wavelengths to create the normal range of colors. Physiological evidence for trichromatic theory was later given by </span>Gunnar Svaetichin<span> (1956).</span>
Answer:
Explanation:
<u>A: keystone </u>
Keystone is also known as capstone, <u>and it is the stone at the highest point of the arch construction.</u> It is placed as the final piece to lock the construction not to fall, as it is distributing the weight of the arch.
<u>B: voussoir</u>
<u>Voussoir is the name of the whole arched part,</u> including keystone and <u>impost</u>. It is the complete curved element, and the blocks included are most usually made out of stone.
<u>C: impost </u>
The impost is the name for the block that lies at the end of the column, a<u>nd it is also used for the block that is the start of the arch-shaped element</u> of the arch. It is the base of the voussoir.
Answer:
about 50,000-10,000 years ago
Explanation:
i looked it up on google
Film is easier with a still image .Theatrical production is all look in one direction and the light is pointing towards the stage.