10th Standard CBSE - Science - Light Reflection and Refraction

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Question - 1

Which one of the following materials cannot be used to make a lens?

  • A Water
  • B Glass
  • C Plastic
  • D Clay

Question - 2

The image formed by a concave mirror is observed to be virtual, erect and larger than the object.Where should be the position of the object?

  • A Between the principal focus and the centre of curvature
  • B At the centre of curvature
  • C Beyond the centre of curvature
  • D Between the pole of the mirror and its principal focus.

Question - 3

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

  • A At the principal focus of the lens
  • B At twice the focal length
  • C At infinity
  • D Between the optical cantre of the lens and its principal focus

Question - 4

A spherical mirror and a thin spherical lens have each a focal length of - 15 cm. The mirror and the lens are likely to be 

  • A both concave
  • B both convex
  • C the mirror is concave and the lens is convex.
  • D the mirror is convex, but the lens is concave.

Question - 5

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

  • A plane
  • B concave 
  • C convex
  • D either plane or convex

Question - 6

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

  • A A convex lens of focal length 50 cm
  • B A concave lens of focal length 50 cm
  • C A convex lens of focal length 5 cm
  • D A concave lens of focal length 5 cm

Question - 7

Which of the following can make a parallel beam of light when light from a point source is incident on it?

  • A Concave mirror as well as convex lens
  • B Convex mirror as well as concave lens
  • C Two plane mirrors placed at 90o to each other
  • D Concave mirror as well as concave lens

Question - 8

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm infront of the mirror. The focal length of this mirror is.

  • A - 30 cm
  • B - 20 cm
  • C - 40 cm
  • D - 60 cm

Question - 9

Under which of the following conditions a concave mirror can form an image larger than the actual object?

  • A When the object is kept at a distance equal to its radius of curvature
  • B When object is kept at a distance less than its focal length
  • C When object is placed between the focus and centre of curvature
  • D When object is kept at a distance greater than its radius of curvature

Question - 10

Which of the following statements is true?

  • A A convex lens has 4 dioptre power having a focal length 0.25 m
  • B A convex lens has -4 dioptre power having a focal length 0.25 m
  • C A concave lens has 4 dioptre power having a focal length 0.25 m
  • D A concave lens has -4 dioptre power having a focal length 0.25 m. 
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