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JAMB Physics 2023 Paper
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© africaexams.com
Question : 35
Total: 65
An object is placed 35 cm away from a convex mirror with a focal length of magnitude 15 cm. What is the location of the image?
26.25 cm behind the mirror
10.5 cm behind the mirror
26.25 cm in front of the mirror
10.5 cm in front of the mirror
Validate
Solution:
f= 15cm (diverging mirror); u= -35cm(because object is in front of the mirror) v=?
⇒
1
f
\frac{1}{f}
f
1
=
1
v
\frac{1}{v}
v
1
-
1
u
\frac{1}{u}
u
1
⇒
1
15
\frac{1}{15}
15
1
=
1
v
\frac{1}{v}
v
1
-
1
−
35
\frac{1}{-35}
−
35
1
⇒
1
15
\frac{1}{15}
15
1
-
1
35
\frac{1}{35}
35
1
=
1
v
\frac{1}{v}
v
1
⇒
105
4
\frac{105}{4}
4
105
=
1
v
\frac{1}{v}
v
1
v =
105
4
\frac{105}{4}
4
105
= 26.25cm
∴The image is 26.25cm behind the mirror
© africaexams.com
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