Physics Grade 8

What is the angle of incidence of a ray of light if the reflected ray is at an angle of 90° to the incident ray?

• 60 degrees

• 45 degrees

• 30 degrees

• 50 degrees

Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.

• Literal conversion

• Lateral version

• Lateral inversion

• colateral conversion

State whether the following statements are true or false:
(a) The moon is an illuminated object.
(b) Diffuse reflection means the failure of the laws of reflection of light.
(c) In a kaleidoscope, a pattern seen once can never be seen again.

• a) False

  b) True

  c)False

• a)False

  b)False

  c)True

• a)True

  b) False

  c)True

• a) False

  b)True

  c)True

State whether the following statements are true or false:
(a) The moon is an illuminated object.
(b) Diffuse reflection means the failure of the laws of reflection of light.
(c) In a kaleidoscope, a pattern seen once can never be seen again.

• a) False

  b) True

  c)False

• a)False

  b)False

  c)True

• a)True

  b) False

  c)True

• a) False

  b)True

  c)True

How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another?
(a) 120°
(b) 45°
(c) 180°
(d) 60°
(e) 90°

• a)2

  b)7

  c)1

  d)5

  e)3

• a)2

  b)1

  c)5

  d)7

  e)3

• a)2

  b)3

  c)7

  d)1

  e)5

• a)2

  b)3

  c)7

  d)1

  e)5

Name the part of the eye:
(a) which controls the amount of light entering the eye.
(b) which converges light rays to form the image.
(c) on which image is formed.
(d) which changes the curvature (or thickness) of eye-lens to focus objects lying at various distances.

• a) Optic nerve

  b)Iris

  c)Lens

  d)Ciliary muscels

• a)Retina

  b)Lens

  c) Iris

  d)Optic nerve

• a) Iris

  b)Lens

  c)Retina

  d)Ciliary muscles

• a)Iris

  b)Retina

  c)Lens

  d)Ciliary muscles