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Physics 10 Chapter 3 - Geometrical Optics - 15
1.
What is the reciprocal of focal length in metres of a lens called?
a) Length of lens
b) Pole of lens
c) Measure of lens
d) Power of lens
2.
In which unit, focal length of the lens should be measured for the power of that lens?
a) Decimetres
b) Centimetres
c) Inches
d) Metres
3.
What is the formula for power of lens?
a) Power of lens = 1 / Focal length in metres
b) Power of lens = 1 / Focal length in inches
c) Power of lens = 1 / Focal length in decimetres
d) Power of lens = 1 / Focal length in centimetres
4.
What is the SI unit of power of a lens?
a) Metre
b) Dioptre
c) Hertz
d) Cycle per second
5.
With which symbol, SI unit of power of a lens is denoted?
a) Symbol: m
b) Symbol: Cs
-1
c) Symbol: D
d) Symbol: Hz
6.
1 dioptre is the power of a lens whose focal length is.................?
a) 1 dm
b) 1 mm
c) 1 cm
d) 1 m
7.
Focal length of convex lens is............?
a) Negative
b) None of these
c) Positive
d) May be positive or negative
8.
Focal length of concave lens is............?
a) May be positive or negative
b) Positive
c) None of these
d) Negative
9.
Power of convex lens is............?
a) Positive
b) Negative
c) May be positive or negative
d) None of these
10.
Power of concave lens is............?
a) None of these
b) May be positive or negative
c) Negative
d) Positive
11.
With the help of how many principal rays, image formation in convex lens can be explained?
a) One
b) Four
c) Two
d) Three
12.
From where ray parallel to the principal axis passes?
a) Through focal point
b) Parallel to principal axis
c) Goes straight
d) Through optical centre
13.
Passing through which part of lens, ray passes through focal point?
a) Through focal point
b) Through pole
c) Through optical centre
d) Through principal axis
14.
Which of the following statement is TRUE about principal rays?
a) Ray passing through optical centre passes straight
b) Ray passing through focus becomes parallel to principal axis
c) Ray parallel to principal axis passes through focal point
d) All are correct
15.
With which symbol, power of a lens is denoted?
a) Symbol: P
b) Symbol: D
c) Symbol: p
d) Symbol: d
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