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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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© examsnet.com
Question : 2
Total: 99
TOPIC 1 -Plane Mirror, Spherical Mirror and Reflection of Light When an object is kept at a distance of
30
c
m
from a concave mirror, the image is formed at a distance of
10
c
m
from the mirror. If the object is moved with a speed of 9
c
m
s
−
1
, the speed (in
c
m
s
−
1
) with which image moves at that instant is ________.
[NA Sep. 03,2020 (II)]
Your Answer:
Validate
Solution:
Distance of object,
u
=
−
30
c
m
Distance of image,
v
=
10
c
m
Magnification,
m
=
−
v
u
=
(
−
10
)
−
30
=
1
3
Speed of image
=
m
2
×
speed of object
=
1
9
×
9
=
1
c
m
s
−
1
© examsnet.com
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