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To illustrate images produced by small apertures. Comprising a polished wooden box with a ground glass screen at one end and a hole at the other.
PR-369 Total Internal Reflection Apparatus
To demonstrate the total internal reflection in a Perspex tube is form of (1) turn coil whole dia. About (120) mm; dia. Of the tube in a Perspex tube about (8) mm. Fitted on the wooden board with laser source.