Object height = 7cm
Object distance = -30 cm
Focal length = -lo com
Image distance =
Image height = ?
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1
Answer:
Given object height (h
o
)=7cm
Object distance (u)=−25cm
focal length (f)=−15cm
Using mirror formula,
u
1
+
v
1
=
f
1
; v= distance of an image
⇒
v
1
=
25
1
−
15
1
∴
v
1
=
75
2.5
⇒v=−37.5cm
The screen should be placed at 37.5cm from the pole of the mirror and infront of the mirror.
Magnification (m)=
h
o
h
i
=−
4
v
⇒
h
o
h
i
=−(
−25
−37.5
)=−1.5
∴h
i
=−(1.5×7)cm=−10.5cm
So, the size of the image is 10.5cm and it will be real, inverted, and magnified
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