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Physics Class 11 - Chapter 10
Optical Instruments Test - 2
1.
The minimum between an object and its real image in a convex lens is?
a) 2.5f
b) 4f
c) 2f
d) 3f
2.
Unit of power of lens is?
a) Diopter
b) Watt
c) Meter
d) Horsepower
3.
The diameter of lens is called?
a) Radius of curvature
b) Aperture
c) Focal length
d) Principal axis
4.
In going from a denser to rare medium a ray of light is?
a) Bent towards normal
b) Bent away from the normal
c) Polarized
d) Undeviated
5.
Angle made by object at observer eyes?
a) Visual angle
b) Real angle
c) All of these
d) Imaginary angle
6.
For minor detail of an object by instrument measuring is known?
a) Resolving power
b) All of these
c) Optical power
d) Power of lens
7.
The power of a concave lenses is?
a) Virtual
b) Positive
c) Negative
d) Real
8.
A point where the incident parallel rays of light converge or appear to diverging after passing through a lens is?
a) Optical centre
b) Centre of curvature
c) Aperture
d) Focus
9.
Diopter power of an concave lens of 10cm focal length is?
a) 1/10 diopter
b) -1/10 diopter
c) -10 diopter
d) 10 diopter
10.
A lens which converges a beam of parallel ray to a point is called?
a) Convex lens
b) Convex lens
c) Plane concave lens
d) Concave lens
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