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Chapter 9: Problem 11

Describe how you could use two large, circular Polaroid filters in front of a circular window as a kind of window shade.

Short Answer

Expert verified
Answer: To control the light intensity using Polaroid filters as a window shade, simply rotate one of the filters relative to the other to change the alignment of their transmission axes. When the transmission axes are aligned, maximum light passes through. When the transmission axes are perpendicular, minimum light passes through. By adjusting the alignment, you can achieve the desired light intensity in the room.

Step by step solution

01

Understanding Polaroid Filters

Polaroid filters are made of special materials that allow only light with a specific polarization to pass through, while blocking the rest. When light passes through a Polaroid filter, it becomes linearly polarized with the direction of polarization parallel to the filter's transmission axis. The degree at which the transmission axis is aligned determines the amount of light allowed to pass through the filter.
02

Setting Up the Window Shade

To create a window shade with Polaroid filters, you can mount two large, circular Polaroid filters in front of a circular window. The filters should be mounted on a rotating axis in such a way that they can be easily rotated.
03

Adjusting Light Intensity

To control the amount of light passing through the circular window, you can rotate one of the filters relative to the other. When the transmission axes of both filters are aligned (parallel to each other), the maximum amount of light will pass through as they will both block the same polarization. On the other hand, when the transmission axes of the filters are perpendicular to each other, the minimum amount of light (almost completely dark) will pass through since the second filter will block the polarization allowed by the first filter.
04

Using the Polaroid Window Shade

Whenever you want to adjust the light intensity in the room, simply rotate one of the Polaroid filters to change the alignment of the transmission axes. By doing so, you can control the amount of light passing through the window to create the desired ambiance in your room. This Polaroid window shade can be particularly useful in rooms that require frequent light adjustments, such as lecture halls, bedrooms, and living rooms.

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