【To all users】

• The high optical flatness on the plates can provide a higher contrast of shades between dark and bright bands so that you observe the clear interference fringes with a pattern of evenly spaced alternating bright and dark bands.
• The high contrast interference fringes on enough length of the plates enable you to calculate the thickness of a thin material such as a cellophane film or a hair based on the number of lines counted and frequency of a monochromatic source (like a Sodium lamp).

• Optical flatness glass plate: 2 pcs, 50 x 200 x 6 mm
• Rubber band: 2 pcs
• Thin paper: 2 pieces
• Plastic film: 2 pieces
• Accessory: a storage box