51. The colour of light is determined by its
52. What is the substance through which light can pass?
53. A person wears spectacles with concave lenses. It means that normally (when not using glasses) the image of distant objects is focused in his eyes
54. LEDs and CFLs are replacing ordinary bulbs for illumination due to
55. Rajat has hypermetropia. What type of lens will the ophthalmologist recommend to correct his vision?
56. Golden view of sea shell is due to
57. The Sun and the Moon appear elliptical near the horizon because of
58. When a mirror is rotated by an angle θ, the reflected ray will rotate by
59. When a ray of light travels from a denser medium to a rarer medium, it bends:
60. A disorder in which a person cannot see a distant object clearly is called.
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