51. The outside rear view mirror of modern automobiles is marked with warning 'objects in mirror are closer than they appear'. Such mirrors are
52. Light waves are . . . . . . . .
53. The generating images on a screen by focusing an electronic beam on phosphorus coated screen is called
54. The minimum height of a plane mirror to see the full size image of a person is equal to
55. Which of the following colors of white light has the highest wavelength?
56. Shaving mirror is
57. A rear-view mirror for driving is
58. We see the color of grass as green because-
59. Which of the following waves can not be polarised?
60. Velocity of light is maximum in
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