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Chapter 14 - Mirror and Lenses - 3
1.
Concave mirrors are used as shaving mirrors are
a) of small focal length
b) of half focal length
c) of suitable focal length
d) of large focal length
2.
The refractive index of air is
a) 1.0003
b) 1.30
c) 0.33
d) 1.000
3.
When a ray of light passes from a denser to a rare medium the refracted ray bends
a) towards the normal
b) parallel to the normal
c) at an angle of 30 degree with normal
d) away from the normal
4.
A prism which has one of its angle equal to 90 degree and each of the remaining two angles are equal to 45 degree is called
a) totally refracting prism
b) reflecting prism
c) totally reflecting prism
d) refracting prism
5.
Totally reflecting prism is placed in front of a
a) video camera
b) projector
c) endoscope
d) gastroscope
6.
White light splits up into colours
a) two
b) four
c) three
d) seven
7.
A normal eye can see objects clearly at a distance from the eye equal to
a) 30cm
b) 15cm
c) 25cm
d) 20cm
8.
There are main defects of human eye
a) five
b) three
c) four
d) two
9.
The primary rainbow light suffers
a) four internal reflections
b) two internal reflections
c) one internal reflection
d) three internal reflections
10.
Match the column..........................diamond
a) in a straight line
b) magnification
c) pole
d) 2.42
11.
Match the column..........................light travels
a) snell's law
b) aperture
c) in a straight line
d) pole
12.
Match the column..........................the centre of a mirror
a) aperture
b) 2.42
c) pole
d) snell's law
13.
Match the column..........................q/p
a) 2.42
b) magnification
c) pole
d) snell's law
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