Pretty sure it is true. sorry if wrong.
Answer:
θ
- θ
Step-by-step explanation:
According to the theory of Malus, when a completely plane polarized light is incident on an analyzer, the intensity 'I' of the light wave transmitted by the analyzer is proportional to the square of the cosine of angle between the transmission axes of the polarizer and analyzer. Therefore:
Using the theory of Malus, we need to estimate the angle between the transmission axis θ
and the polarization axis θ
.
Thus:
angle θ = θ
- θ
<u>ANSWER</u>

<u>EXPLANATION</u>
The given series

This is an arithmetic series with a common difference of

The first term of the series is:

The general term is given by:




The last term is 81
We can use this to determine the number of terms in the series.




The summation notation is:

-x^4 - 3x^3 is the answer to the question