In optic fiber transmission system _______ are used regenerate the dim light signal?
A. Diodes
B. Repeaters
C. Laser
D. Transformer
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Physics
The value of critical angle for glass is
A. 42°
B. 47°
C. 52°
D. 50°
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point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called
A. center of curvature
B. focus
C. optical center
D. aperture
Dioptre power of an concave lens of 10 cm focal length is
A. 10 dioptre
B. 10 dioptre
C. 1 / 10 dioptre
D. 1 / 10 dioptre
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A convex lens gives a virtual image only when the objects lies
A. between principal focus and center of curvature
B. beyond 2 f
C. at the principal focus
D. between principal focus and optical center
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Least distance of distinct vision
A. increases with increase in age
B. decreases with increase in age
C. neither increases nor decreases
D. becomes infinite after 60 years
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For normal adjustment, length of astronomical telescope is
A. fo + fe
B. fo – fe
C. fo / fe
D. fe / fo
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