Polaroid Disc Mounted
Product Code : EL-LAO-10353
Quick answer: The Polaroid Disc Mounted is a polarizing filter used to show that light is a transverse wave: two discs used as polarizer and analyser vary the transmitted light as one is rotated, and reveal stress patterns in plastics, glass and minerals. The film sits between protective glass in a plastic ring with a 50 mm clear aperture. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Clear aperture | 2 in (50 mm) |
| Construction | Polarizing film sandwiched between protective glass |
| Mounting | High-impact plastic retaining ring |
Two discs are needed for polarizer-analyser experiments; state the number of discs required when asking for a quotation.
How the polarization experiment is done
Ordinary light vibrates in all directions at right angles to its path. A polarizing disc passes only the component vibrating along one axis, so the light leaving it is plane polarized. A second disc, the analyser, then transmits an amount that depends on the angle theta between the two axes; by Malus's law I = I0 cos^2 theta, the field is brightest when the axes are parallel and darkest when they are crossed at 90 degrees.
Between crossed discs, a strained transparent object such as a bent plastic ruler, a moulded protractor or a piece of stressed glass shows coloured fringes where the internal stress is concentrated. The same arrangement shows the birefringence of mineral flakes and liquid crystals.
- Look at a lamp or bright window through one disc and rotate it; the brightness barely changes.
- Add a second disc and rotate it slowly; the light dims to near darkness when the axes are crossed.
- Place a clear plastic object between the crossed discs and flex it to see the stress pattern change.
- View light reflected from a glossy bench or water surface, which is partly polarized, through a single disc and rotate it.
Key features
- Clear aperture of 2 in (50 mm) for comfortable viewing.
- Polarizing film protected on both faces by glass.
- High-impact plastic retaining ring for safe handling by students.
- Works as polarizer or analyser when used in pairs.
- Shows stress patterns in plastics, glass, liquid crystals and minerals.
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the mounted polaroid disc at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Light and Optics products
- Tripod Magnifier (EL-LAO-10352)
- Prism Microscope (EL-LAO-10351)
- Newton's Ring Apparatus (EL-LAO-10350)
- Plastic Mirror (EL-LAO-10349)
- Single Lens Eye Loupe (EL-LAO-10348)
- Glass Lens Demonstration (EL-LAO-10347)
The full range is in the Light and Optics section of the Physics Lab range.
Frequently asked questions
What does a polaroid disc demonstrate?
It demonstrates polarization of light. With two discs, rotating one varies the transmitted light, and placing a strained plastic or glass piece between crossed discs shows its stress pattern.
What is the aperture of the mounted polaroid disc?
The clear aperture is 2 in (50 mm). The polarizing film is protected between glass and held in a high-impact plastic ring.
What is the price of the mounted polaroid disc?
Prices are not published on the website. Add the mounted polaroid disc to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-LAO-10353 and the quantity, to receive a quotation.
Does Lab Exports manufacture the mounted polaroid disc?
Yes. Lab Exports manufactures the mounted polaroid disc at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-LAO-10353.
Request a quote
Email [email protected] with the house code EL-LAO-10353 and the quantity, or add the mounted polaroid disc to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
