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Category: Optical Instruments
The function of collimeter in spectrometer is________________?
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A. to produce parallel beams of light
B. to filter the light rays
C. to make them
D. no function
Magnification of the astronomical telescope is_____________?
A. fo+fe
B. fo/fe
C. fe/fo
D. (1+fo/fe)L/fo
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
For normal adjustment, length of astronomical telescope is______________?
A. fo + fe
B. fo – fe
C. fo / fe
D. fe / fo
A 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
In optic fiber transmission system _____________ are used regenerate the dim light signal?
A. Diodes
B. Repeaters
C. Laser
D. Transformer
A convex lens acts as a diverging lens if the_________________?
A. object is beyond C
B. if the object is with in C
C. if the object is within f
D. both B and C
The minimum distance between an object and its real image in a convex lens is_____________?
A. 2 f
B. 2.5 f
C. 3f
D. 4f
Michelson devised the formula to calculate the speed of light_______________?
A. C = 4fd
B. C = 8fd
C. C = 16fd
D. C = 5/2fd
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