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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