Hartley's Optical Disc

The Hartley's Optical Disk unit consists of a 230 mm rotatable disc with a 360-degree graduated scale, mounted on a sturdy stand with a light source. It is designed to demonstrate various optical phenomena, including the laws of reflection and refraction, total internal reflection, and dispersion. The complete set of accessories includes an equilateral prism, a right-angled prism, a convex lens, a concave lens, a rectangular slab, a semi-circular shape, a plano-convex lens for the ray box, two dark screens (with single, double, and triple lines and a wide gap), two metallic side screens/covers, two base stands, and two fly nuts with washers.