Class VII

Lens used in spectacles for correction of defects of vision is
  1. Always concave
  2. Concave or convex
  3. Lens of different shape
  4. Always convex
Which of the following object can acts and both converging and diverging mirror?
  1. Steel spoon
  2. Plane mirror
  3. Polished floor
  4. Knife
The bright spot formed on the surface if a convex lens is hold in sun is the
  1. Dust particles in air
  2. Rays of diverging light
  3. Image of sun
  4. Rays of converging light
Concave mirror is used as shaving mirror because it forms
  1. Real and erect image
  2. Virtual and inverted image
  3. Virtual and magnified image
  4. Real and magnified image
An object of length 5 cm is placed at a distance of 20 cm in front of a plane mirror. The size and position will be
  1. 5 cm high and 20 cm behind the mirror
  2. 5 cm high and 20 cm in front of mirror
  3. 5 cm high and 10 cm behind the mirror
  4. 3 cm high and 20 cm behind the mirror
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