Physics
Physical Optics
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#113 For glass of refractive index 1.5, the polarizing angle is about
A) 33.7°
B) 45°
C) 56.3°
D) 60°
#114 The critical angle for total internal reflection is given by
A) \( \sin C = 1/n \)
B) \( \cos C = 1/n \)
C) \( \tan C = 1/n \)
D) \( \cot C = 1/n \)
#115 For water of refractive index 1.33, the critical angle is about
A) 41.2°
B) 48.8°
C) 56.3°
D) 62.5°
#116 For diamond of refractive index 2.42, the critical angle is about
A) 24.4°
B) 33.7°
C) 41.2°
D) 48.8°
#117 The phenomenon of total internal reflection is used in
A) Prism binoculars
B) Optical fibers
C) Periscopes
D) All of these
#118 The resolving power of a grating is given by
A) \( R = n N \)
B) \( R= \lambda / d \)
C) \( R= d / \lambda \)
D) \( R= N n \)
#119 The dispersive power of a grating is given by
A) \( \frac{d \theta}{d \lambda} = n d \cos \theta \)
B) \( \frac{d \theta}{d \lambda} = n d \sin \theta \)
C) \( \frac{d \theta}{d \lambda} = n \cos \theta \)
D) \( \frac{d \theta}{d \lambda} = n \sin \theta \)
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