An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed
-
A.
0.5 -
B.
1.5 -
C.
2.0 -
D.
3.0
Correct Answer: Option D
Explanation
(frac{1}{U} + frac{1}{V} = frac{1}{F})
(frac{1}{V} = frac{1}{F} – frac{1}{U})
(frac{1}{V} = frac{1}{15} – frac{1}{20})
(frac{1}{V} = frac{text{4 – 3}}{60})
(frac{1}{V} = frac{1}{60})
V = 60cm
M = (frac{V}{U} = frac{60}{20})
M = 3.0cm