Geometrical Optics
After reflection from a concave mirror, rays of light parallel to the principal axis converge to a point which is called
pole
center of curvature
focal length
principal focus
principal focus
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The critical angle for glass isA. 50 ยฐ
B. 42 ยฐ
C. 45 ยฐ
D. 30 ยฐ
The endoscope used to examine the bladder is called
A. cystoscope
B. gastroscope
C. microscope
D. bronchoscope
In photograph enlarger, the object is placed
A. between F and 2F
B. beyond 2F
C. at F
D. less than F
The iris has an opening at its center which is called
A. cornea
B. pupil
C. retina
D. chord
The reflection by the smooth surfaces is called
A. regular reflection
B. irregular reflection
C. regular refraction
D. irregular refraction
Both virtual and real images can be formed by a
A. plane mirror
B. convex mirror
C. concave mirror
D. silver mirror
Water separates the colors of sunlight into a rainbow due to
A. rain
B. dispersion in sunlight
C. dispersion in drops
D. clouds
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