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Physics
Physics
Problem
A short linear object of length
b
b
b
lies along the axis of a concave mirror of focal length
f
f
f
at a distance
u
u
u
from the pole of the mirror. The size of the image is approximately equal to a.
b
(
u
−
f
f
)
1
/
2
b \left( \frac{u-f}{f} \right)^{1/2}
b
(
f
u
−
f
)
1/2
b.
b
(
f
u
−
f
)
1
/
2
b \left( \frac{f}{u-f} \right)^{1/2}
b
(
u
−
f
f
)
1/2
c.
b
(
u
−
f
f
)
b \left( \frac{u-f}{f} \right)
b
(
f
u
−
f
)
d.
b
(
f
u
−
f
)
2
b \left( \frac{f}{u-f} \right)^2
b
(
u
−
f
f
)
2
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