Lecture

3D Cinema Glasses: Polarization and Optical Systems

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Description

This lecture discusses the optical properties of 3D cinema glasses, focusing on the polarization angles of the lenses and how they interact when viewing other viewers' glasses. By analyzing the conditions for light transmission and opacity, the instructor explains the necessity of having the lenses polarized at 45 degrees to ensure proper separation of the left and right eye images. Different scenarios are explored, highlighting the importance of the lenses being perpendicular to each other and aligned with the Earth's surface normal for effective image discrimination. The lecture concludes by emphasizing the significance of maintaining a 90-degree angle between the lenses to ensure each eye sees the correct image in 3D cinema projection.

Official source

Related concepts (24)

Earth radius

Earth radius (denoted as R🜨 or ) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid, the radius ranges from a maximum of nearly (equatorial radius, denoted a) to a minimum of nearly (polar radius, denoted b). A nominal Earth radius is sometimes used as a unit of measurement in astronomy and geophysics, which is recommended by the International Astronomical Union to be the equatorial value. A globally-average value is usually considered to be with a 0.

Polarization (physics)

Polarization (also polarisation) is a property of transverse waves which specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave. A simple example of a polarized transverse wave is vibrations traveling along a taut string (see image); for example, in a musical instrument like a guitar string. Depending on how the string is plucked, the vibrations can be in a vertical direction, horizontal direction, or at any angle perpendicular to the string.

Figure of the Earth

Figure of the Earth is a term of art in geodesy that refers to the size and shape used to model Earth. The size and shape it refers to depend on context, including the precision needed for the model. A sphere is a well-known historical approximation of the figure of the Earth that is satisfactory for many purposes. Several models with greater accuracy (including ellipsoid) have been developed so that coordinate systems can serve the precise needs of navigation, surveying, cadastre, land use, and various other concerns.

Elliptical polarization

In electrodynamics, elliptical polarization is the polarization of electromagnetic radiation such that the tip of the electric field vector describes an ellipse in any fixed plane intersecting, and normal to, the direction of propagation. An elliptically polarized wave may be resolved into two linearly polarized waves in phase quadrature, with their polarization planes at right angles to each other. Since the electric field can rotate clockwise or counterclockwise as it propagates, elliptically polarized waves exhibit chirality.

Gravity of Earth

The gravity of Earth, denoted by g, is the net acceleration that is imparted to objects due to the combined effect of gravitation (from mass distribution within Earth) and the centrifugal force (from the Earth's rotation). It is a vector quantity, whose direction coincides with a plumb bob and strength or magnitude is given by the norm . In SI units this acceleration is expressed in metres per second squared (in symbols, m/s2 or m·s−2) or equivalently in newtons per kilogram (N/kg or N·kg−1).

Related lectures (63)

Polarisation: Reminders, Animations, and Vector Analysis

Explores the theory and animations of linear, circular, and elliptical polarisations in electromagnetic waves.

Polarisation of Photons

Explores photon polarisation, including linear, circular, and elliptical polarisation concepts.

Polarized Light Microscopy: Techniques and Applications

Explores polarized light microscopy techniques, including observing spherulites and birefringence in specimens, and analyzing various materials.

General Notions of Optical Activity and Birefringence

Explores optical activity, birefringence, polarization of light, and liquid crystal displays.

Introduction to Microscopy