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||<30% style="text-align:center">[[PiraScheme#Mechanics|Table of Mechanics Demonstration]] ||<30% style="text-align:center">[[MEEquipmentList|List of Mechanics Equipment & Supplies]] ||<30% style="text-align:center">[[Demonstrations|Lecture Demonstrations]] || ||<30% style="text-align:center">[[PiraScheme#Optics|Table of Optics Demonstration]] ||<30% style="text-align:center">[[OPEquipmentList|List of Optics Equipment & Supplies]] ||<30% style="text-align:center">[[Demonstrations|Lecture Demonstrations]] ||
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 * '''Bay:''' [[OpticsCabinetBayA1|(A1)]]  * '''Bay:''' [[OpticsCabinetBayA2|(A2)]]
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||Calcite crystal ||[[OpticsCabinetBayA1|OP, Bay A1, Shelf #1]] || || ||Calcite crystal ||[[OpticsCabinetBayA2|OP, Bay A2, Shelf #1]] || ||

Table of Optics Demonstration

List of Optics Equipment & Supplies

Lecture Demonstrations

Double Refraction in Calcite, 6H35.15

Topic and Concept:

Location:

Abstract:

Rotate crystal of calcite (also known as Iceland Spar) above printed text. Two images are visible; one remains fixed as the crystal is rotated, the other circumnavigates the first.

In the above left picture, see the "S" in "Spar" forms two images, which lie on a diagonal line running from upper left to lower right.

In the above right picture, the two images of the "S" now lie on a diagonal line running from upper right to lower left.

The fixed image is due to the so-called "ordinary" ray. The mobile image is due to the so-called "extraordinary" ray. (It's not easy to tell in the above pictures which image is fixed and which is mobile).

If a linear polarizer is available, it can be used to show that each ray is polarized, and that the angles of polarization of the two rays differ by 90°.

Equipment

Location

ID Number

Calcite crystal

OP, Bay A2, Shelf #1

Linear Polarizer

OP, Bay B5, Shelf #2

Discussion:

The mathematical description of birefringence seems too advanced for an introductory course, however the demonstration may catch students' interest.

Videos:

References:

Home

fw: Calcite (last edited 2016-06-14 22:15:02 by JamesReardon)