Two ploarising sheets are kept with their polarising direction parallel such that the intensity of transmitted light is maximum. Calculate the angle through which one of the sheets must be turned if the intensity of transmitted light is to drop by `1/4` ?

Explanation

To solve the problem of how much one of the polarising sheets must be turned to reduce the intensity of transmitted light by 1/4, we will use Malus's Law. Here’s the step-by-step solution:

### Step 1: Understand the Initial Condition
When two polarising sheets are aligned parallel to each other, the intensity of the transmitted light is at its maximum. Let the initial intensity of the light be \( I_0 \).

### Step 2: Apply Malus's Law
According to Malus's Law, the intensity \( I \) of light transmitted through a polariser is given by:
\[
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