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Q.1
In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of __________
Light Collection
Light Scattering
Light Dispersion
Light Polarization
Q.2
We combine two lenses, one is convex and other is concave having focal lengths /, and f2 and their combined focal length is F. Combination of the lenses will behave like concave lens, if
f1 > f2
f1 = f2
f1 < f2.
f1 ≤ f2
Q.3
Which part is not included in the fiber-optic communication system?
Transmitter
Transmission channel
Transformer
Receiver
Q.4
What magnification level is referred to as High Power Objective
4X
40X
10X
100X
Q.5
A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power isThe magnifying power of the other lens is:
10
20
50
25
Q.6
The magnification produced by the objective lens and the eye lens of a compound microscope areand 6 respectively. The magnifying power of this microscope is:
19
31
150
120
Q.7
The magnifying power of an astronomical telescope is 8 and the distance between the two lenses iscm. The focal length of eye lens and objective lens will be respectively:
6 cm and 48 cm
48 cm and 6 cm
8 cm and 64 cm
64 cm and 8 cm
Q.8
An optical instrument used for magnification has powerD of objective andD of eyepiece. Whether it is a microscope or a telescope?
Microscope
Telescope
Q.9
The magnifying power of an astronomical telescope in normal adjustment isThe distance between the objective and the eyepiece iscm. The focal length of the objectives and eyepiece is
10 cm and 1 cm respectively
100 cm and 1 cm respectively
1 cm and 100 cm respectively
1 cm and 10 cm respectively
Q.10
The power of a thin convex lens of glass is 5 D. When it is immersed in a liquid, then it behaves like a divergent lens of focal lengthcm. The refractive index of the liquid is:(Given, refractive index of glass = μ = 1.5)
3/5
1/2
2/3
5/3
Q.11
A convex lens of refractive index 3/2 has a power of 2.5 D in air. If it is placed in a liquid of refractive index 2 then the new power of the lens is
– 1.25 D
– 1.5 D
1.25 D
1.5 D
Q.12
A convex lens and a concave lens, each having the same focal length ofcm, are put in contact to form a combination of lenses. The power of the combination (in dioptres) is
zero
25
50
infinity
Q.13
The objective of a compound microscope is essentially:
A concave lens of small focal length and small aperture
Convex lens of small focal length and large aperture
Convex lens of large focal length and large aperture
Convex lens of small focal length and small aperture
Q.14
If the focal length of the objective lens is increased then,
Magnifying power of microscope will increase but that of telescope will decrease
Magnifying power of microscope and telescope both will increase
Magnifying power of microscope and telescope both will decrease
Magnifying power of microscope will decrease but that of telescope will increase
Q.15
Finger prints are observed by the use of :
Telescope
Microscope
Newtonian telescope
Concave lens
Q.16
The eyepiece of an astronomical telescope has a focal length ofcm. The telescope is focused for normal vision of distant objects when the tube length is 1 m. The focal length of the objective is:
20 cm
10 cm
90 cm
100 cm
Q.17
To increase the angular magnification of a simple microscope, one should increase:
the focal length of the lens
the power of the lens
the aperture of the lens
the object size
Q.18
The angular magnification of a system is less than one. Does it mean that the image formed is inverted?
Yes
No
Q.19
Through my lenses, it is possible to see the colors and the beak’s size of some birds in the forest.Who am I?
Camera
Binoculars
Glasses
Q.20
Through my lenses, scientists were able to observe microorganisms and could develop the antibiotics that fight many diseases. Who am I?
Binoculars
Microscope
Telescope
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