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86. The absolute refractive index of any medium is (NTSE Gujarat, Stage-I, 2015-16)
1
>1
<2
0
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87. If a ray of light incident on a plane mirror is such that it makes an angle of 300 with the mirror, then the angle of reflection will be (NTSE Chhattisgarh, Stage-I, 2016-17)
300
450
550
600
88. The unit of refractive index is (NTSE Chhattisgarh, Stage-I, 2016-17)
Meter
Degree
Dioptre
It has no unit
89. Which of the following colour of light undergoes the maximum deviation while passing through a glass prism? (NTSE Chhattisgarh, Stage-I, 2016-17)
Red
Blue
Violet
Green
90. A converging bundle of light rays in the shape of cone with a vertex angle of 450 falls on a circular diaphragm of 20 cm diameter. A lens with power 5 D is fixed in the diaphragm. Diameter of face of lens is equal to that of diaphragm. If the vertex angle of new cone is θ , then tanθ = (NTSE Andhra Pradesh, Stage-I, 2015-16)
1.5
2
3
√3
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