A linear shaped object AB of length 
cm is placed before a concave mirror as shown in figure. The focal length of concave mirror is 20 cm. Length of image in cm is …. × 
cm.
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Ans. 1
Sol.
for B, u = 30 + 10 = 40 cm
f = 20 cm
v = 40 cm for B
m = – 
= –1 B 1
for A u = + 30 f = + 20, v = + 60
A 1 B 1 = 
= 
= 
cm
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