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Chapter 10 - Optical Instruments - 3
1.
Abbreviation LED means .........................
a) Light emitting diode
b) Light End Done
c) Low End Diod
d) Lite Emitting Diode
2.
The wavelength used in fibre optic communication system lies in the .......................region of emw.
a) Higher
b) Lower
c) Infra red
d) Temporary
3.
Total internal reflection hap pence when angle of incidence is greater than the ..........................angle of the material.
a) Optical
b) Final
c) Critical
d) Initial
4.
Cladding is a layer of ......................refractive index lower.
a) Lower
b) Upper
c) Lesser
d) Greater
5.
The ratio of size of image to object is called
a) Optical length
b) Magnification
c) Least distance
d) h
2
/ h
6.
The minimum distance at which an object can be seen distinctly is called
a) Least distance
b) h
2
/ h
c) Focal distance
d) Maximum distance
7.
To find virtual image by a convex lens, the object is placed within the
a) Focal point
b) Focal length
c) Optical focus
d) Optical length
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