An object of height 2.5cm is places 20cm from a convex mirror of focal length...
PHYSICS
WAEC 2012
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: A. 2.5 cm
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
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