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Physics Class 11 - Chapter 10
Optical - Instruments Test - 1
1.
Centre of sphere from which spherical surface of lenses is obtained?
a) Centre of mirror
b) Centre of curvature
c) Centre of sphere
d) Centre of lenses
2.
Every lenses has centre of curvature?
a) 1
b) 3
c) Infinite
d) 2
3.
For very small angle we can equate?
a) None of these
b) Angular magnification
c) Linear magnification
d) Both of these
4.
The lens which is thicker at the middle and thinner at the edges is?
a) Optical and convex
b) Optical lens
c) Convex lens
d) Concave lens
5.
Principal axis is the line joining its?
a) Two centre of axis
b) One centre of axis
c) Infinite centre of axis
d) Three centre of axis
6.
Which one is true about concave lenses?
a) It has negative sign
b) Thicker at the edges
c) It is thinner at middle
d) It has positive sign
7.
Positive sign is used where rays?
a) Actually destructed
b) Imaginary intersected
c) Actually intersected
d) Imaginary destructed
8.
Every lens is a part of?
a) Earth
b) All of these
c) Mirror
d) Sphere
9.
Radius of sphere from which spherical surface of lenses is obtained is called?
a) Radius of lenses
b) Radius of sphere
c) Radius of mirror
d) Radius of curvature
10.
Branch of physics which deals with the study of image formation?
a) Geometric optics
b) Optical instruments
c) Rotational optics
d) Optics
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