The shape of the reflector in a LEKO is:

• A. Ellipsoidal
• B. Spherical
• C. Parabolic
• D. Flat

Answer: (A)

LEKO uses an ellipsoidal reflector to produce a controllable, crisp beam. An ellipsoidal reflector has two focal points, so the lamp is placed at the first focus and the light reflects toward the second focus where the lens sits. This setup lets the beam be shaped and kept sharp by the lens, shutters, and iris, giving precise control over the light’s size and edge. A spherical reflector would blur the edges and be harder to control; a parabolic reflector would tend to collimated (nearly parallel) rays with less ability to form a focused image through the lens; a flat reflector would not concentrate or direct the light effectively.