Answer:
C,C
Explanation:
1. I think the lens is a polarizer, so, during its rotation, the amount of light that passes through is reduced.
2. f=v/lambda
The speed is same.
lambda2 = (f1 / f2) * lambda
Lambda2 = ( 6.7 * 10^14 / 3.35 * 10^14 ) * 450nm = 900nm
