• Concave Mirror

  • Convex Mirror

  • Plane Mirror

  • None of these


A search light produces an intense parallel beam of light. This requires a reflector of large aperture. When a source is placed at the focus of a large concave mirror only the paraxial rays (not the marginal rays) are reflected as parallel beam, but when a source is placed at the focus of parabolic mirror all the rays are reflected as an intense parallel beam.