please help me in match the following
Answers
Answer:
I think c
......
.
.
Mark as brainliest
Answer:
12th
Physics
Ray Optics and Optical Instruments
Combination of Mirror and Lenses
An object is kept in front ...
PHYSICS
An object is kept in front of a concave mirror of focal length 20 cm. The image is three times the size of the object.Calculate two possible distance of the object from the mirror.
MEDIUM
Help best friend
Study later
ANSWER
It is given that,
Focal length
f=−20cm
h
i
=3h
o
The image is three times the size of the object. So there are two cases.
Case 1. For real image
m=−
u
v
=−3
v=3u
Using mirror’s formula
f
1
=
v
1
+
u
1
−20
1
=
3u
1
+
u
1
u=
3
−80
cm
Case 2. For virtual image
m=
u
−v
=+3
v=−3u
Again using mirror’s formula
−20
1
=
−3u
1
+
u
1
u=
3
−40
cm
The possible values of u are
3
−80
cmand
3
−40
cm.