An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.
-
A.
2.5 cm -
B.
3.0cm -
C.
5.0cm -
D.
25.0cm
Correct Answer: Option A
Explanation
(frac{1}{v} = frac{1}{f} – frac{1}{u})
= (frac{1}{10} – frac{1}{2} = frac{1}{20})
v = 20
but h(_i) = (frac{v times h_o}{u})
= (frac{20 times 2.5 }{20})
= 2.5cm