Q.31)-Lens is made up of
  • Pyrex glass
  • Flint glass
  • Ordinary glass
  • Cobalt glass
Q.32)-For a person having hypermetropia, the near point is
  • Greater than 25cm
  • Greater than 50 cm
  • Less than 25 cm
  • Infinity
Q.33)-The head mirror used by ENT doctors is
  • Concave
  • Convex
  • Plane
  • Plano-convex
Q.34)-Vehicles use_____to see the objects coming from behind
  • Concave lens
  • Convex lens
  • Concave mirror
  • Convex mirror
Q.35)-What is a compound microscope
  • A microscope that has one lens
  • A microscope that has two set of lenes
  • A microscope whose lenses are concave
  • A microscope whose lenses are convex
Q.36)-Convex mirrors are used as a rear view mirror in motor cycles because
  • It forms real image
  • It forms erect image
  • It forms smaller image as compared with object
  • All of the above
Q.37)-Persons suffering from myopia are advised to use
  • Convex lens
  • Concave lens
  • Plano-concave lens
  • Plano-convex lens
Q.38)-Magnifying glass is basically a
  • Plano-concave lens
  • Cancave lens
  • Convex lens
  • Cylindrical lens
Q.39)-Shaving mirror is
  • Convex
  • Concave
  • Plane
  • Parabolic
Q.40)-Which type of mirror is used in the head lights of vehicles
  • Plane mirror
  • Concave mirror
  • Convex lens
  • Parabolic mirror