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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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© examsnet.com
Question : 44
Total: 99
A particle is oscillating on the X-axis with an amplitude
2
c
m
about the point
x
0
=
10
c
m
with a frequency
ω
. Aconcave mirror of focal length
5
c
m
is placed at the origin (see figure) Identify the correct statements:
(A) The image executes periodic motion
(B) The image executes non-periodic motion
(C) The turning points of the image are asymmetric w.r.t the image of the point at
x
=
10
c
m
(D) The distance between the turning points of the oscillation of the image is
100
21
=
0
[Online April 15, 2018]
(B), (D)
(B), (C)
(A), (C), (D)
(A), (D)
Validate
Solution:
When object is at
8
c
m
Image
V
1
=
f
×
u
u
−
f
=
5
×
8
8
−
5
=
−
40
3
c
m
When object is at
12
c
m
Image
V
2
=
f
×
u
u
−
f
=
5
×
12
12
−
5
=
−
60
7
c
m
Separation
=
|
V
1
−
V
2
|
=
40
3
−
60
7
=
100
21
c
m
So
A
,
C
and
D
are correct statements.
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