i added an image. i hope it helped :)
It starts or speeds up.
Some substances need certain amount of energy in order to react with each other.
Because they have different measurements and weight and mass and some measurements are the same
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Answer:
The transmitted intensity through all polarizers is 
Explanation:
According to Malu's law the intensity of a polarized light having an initial intensity
is mathematically represented as

Now considering the polarizer(The polarizing disk) the equation above becomes

Where n is the number of polarizers
Substituting
for the initial intensity 3 for the n and 20° for the angle of rotation

