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