A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
-
A.
12cm -
B.
24cm -
C.
48cm -
D.
108cm
Correct Answer: Option B
Explanation
F = (frac{uv}{u + v})
v = 3u
18 = (frac{3u times u}{3u + u})
u = 24cm