Abstract: The present invention relates to an exchangeable optical principles demonstrating kit. The kit includes a retractable sleeve structure having a first end and a second end; a grating plate including a grating film; and a pinhole plate including a pinhole opening, wherein the grating plate is selectively attached to the retractable sleeve structure by a magnetic connection, to render the exchangeable optical principles demonstrating kit to form an optical interference principle demonstrating device, and the pinhole plate is selectively attached to the retractable sleeve structure by a magnetic connection, to render the exchangeable optical principles demonstrating kit to form an optical pinhole principle demonstrating device.

Abstract: The present invention relates to a traveling wave demonstrating device. The device includes a base structure including a time window, a plurality of x-axis scales, a plurality of medium slots and a set of linear track former to form a traveling wave channel, each of which the plurality of medium slots are providing for a medium to have a free motion therein; and a traveling wave substrate movably configured on the traveling wave channel and including a plurality of time scales and a wave form opening, wherein the medium is configured to put into both the wave form opening and one of the plurality of medium slots, and when the traveling wave substrate moves along the traveling wave channel, the medium is driven to have a reciprocal motion confined in the one of the plurality of medium slots.

Abstract: The present invention relates to an optical polarization effect demonstrating device. The device includes a first circular rotating polarization disk including a first main observation window and a first polarization film having a first polarization direction viewable through the first circular observation window; and a second circular rotating polarization disk including a second main observation window and a second polarization film having a second polarization direction viewable through the second circular observation window, wherein the first circular rotating polarization disk and the second circular rotating polarization disk are rotatably assembled in a concentric way such that the first circular rotating polarization disk and the second circular rotating polarization disk are rotatable with each other, and the first polarization direction is different from the second polarization direction.

Abstract: The present invention relates to an exchangeable optical principles demonstrating kit. The kit includes a retractable sleeve structure having a first end and a second end; a grating plate including a grating film; and a pinhole plate including a pinhole opening, wherein the grating plate is selectively attached to the retractable sleeve structure by a magnetic connection, to render the exchangeable optical principles demonstrating kit to form an optical interference principle demonstrating device, and the pinhole plate is selectively attached to the retractable sleeve structure by a magnetic connection, to render the exchangeable optical principles demonstrating kit to form an optical pinhole principle demonstrating device.