A. 100cm
B. 33cm
C. 29cm
D. 20cm
Correct Answer: Option D
D. 20cm
Explanation
M = v/u
v = mu = 4 x 25 = 100m
1/v+1/u=1/f
1/100+1/25=1/f
f = 20cm
A. 100cm
B. 33cm
C. 29cm
D. 20cm
Correct Answer: Option D
D. 20cm
Explanation
M = v/u
v = mu = 4 x 25 = 100m
1/v+1/u=1/f
1/100+1/25=1/f
f = 20cm
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