In optic fiber transmission system _____________ are used regenerate the dim light signal?
A. Diodes
B. Repeaters
C. Laser
D. Transformer
Physics Mcqs
The value of critical angle for glass is_______________?
The value of critical angle for glass is_______________?
A. 42°
B. 47°
C. 52°
D. 50°
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?
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
Dioptre power of an concave lens of 10 cm focal length is_______________?
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
The minimum distance between an object and its real image in a convex lens is_____________?
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
A convex lens gives a virtual image only when the objects lies_________________?
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
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?
A. 0.5
B. 0.2
C. 1
D. 2
Least distance of distinct vision_____________?
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
Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?
Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?
A. zero
B. focus
C. 2 f
D. f/2
For normal adjustment, length of astronomical telescope is______________?
For normal adjustment, length of astronomical telescope is______________?
A. fo + fe
B. fo – fe
C. fo / fe
D. fe / fo