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81. Dentists use to see large image of the teeth of patients using (NTSE Madhya Pradesh, Stage-I, 2016-17)
Convex mirror
Convex lens
Concave lens
Concave mirror
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82. When light travels from medium X to medium Y as shown (NTSE Rajasthan, Stage-I, 2015-16)
Both the speed and the frequency decrease
Both the speed and the frequency increase
Both the speed and the wavelength decrease
Both the wavelength and the frequency are unchanged
83. The image formed by a concave mirror is observed to be real, inverted and larger than the object. Where should be the position of the object? (NTSE Rajasthan, Stage-I, 2016-17)
At the center of curvature
Between the principal focus and center of curvature
Beyond the center of curvature
Between the pole of the mirror and its principal focus
84. What is the focal length of a convex lens having power +5.0 D? (NTSE Gujarat, Stage-I, 2016-17)
-10 cm
-20 cm
+10 cm
+20 cm
85. A light ray enters from denser medium to rarer medium. What is the angle of incidence called that has 900 angle of reflection? (NTSE Gujarat, Stage-I, 2015-16)
Angle of reflection
Critical angle
Angle of deviation
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