Hartl Optical Disk, 1 Each

The Hartl Optical Disk by United Scientific is a ray optics apparatus with a 9 in graduated disk on a stand, a ray box on an adjustable arm and six magnetic-backed clear acrylic lenses and prisms. The disk rotates 360 degrees so students can vary and read the angle of incidence directly. Physics teachers use it for refraction and total internal reflection demonstrations; a 12V/2A power supply is required.