Brighten up your optics lab with this versatile light ray box! Made of durable plastic, this light ray box is both rugged and affordable. Use included slit plates to project parallel light beams to study reflection, refraction and focal length. Two finned sides include built-in mirrors that can be moved to any angle. Use colored filters to reflect light off the mirrors to demonstrate the result of color mixing. Includes internal halogen bulb; red, blue and green color filters; and slit plates with one, two, three and four slits. A 12 V, 2 A power source is required and available separately (US only). 6½" x 3" x 2".