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Chapter 10 - Optical Instruments - 1
1.
The least distance of distinct vision is:-
a) 25 cm
b) 25 mm
c) 2.5 cm
d) 25 cm
2.
The magnifying power of a simple microscope is:-
a) 2 + f / d
b) 1 - d / f
c) 1 + f / d
d) 1 + d / f
3.
The magnifying power of a compound microscope is:-
a) Magnification of objective - Magnification of eye piece
b) Magnification of objective + Magnification of eye piece
c) Magnification of objective/Magnification of eye piece
d) Magnification of objective x Magnification of eye piece
4.
The length of astronomical refracting telescope refracting telescope with convex lens as eye piece for normal adjustment is:-
a) f
o
+ f
e
b) f
o
x f
e
c) f
o
- f
e
d) f
o
/ f
e
5.
In astronomical telescope the image formed by eye piece is:-
a) real
b) neither real nor virtual
c) none of these
d) virtual
6.
In spectrometer the collimator is used to:-
a) none of above
b) disperse the beam]
c) reflect the beam
d) collimate the beam
7.
An image formed by a concave lens is always:-
a) real
b) none of the above
c) inverted
d) virtual
8.
Critical angle of a medium depends upon the:-
a) intensity of the beam of light
b) relative refractive index of the two medium
c) speed of light in air
d) refractive index of the denser medium
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