An object 3.0cm high is placed 60.0cm from a converging lens whose focal length is 20.0cm. Calculate the size of the image formed
A
0.5cm
B
1.5cm
C
2.0cm
D
6.0cm
Verified Correct Answer: B.
Physical Principles & Numerical Solution
F = \(\frac{UV}{U + V}\)
20 = \(\frac{60 \times V}{60 + V}\)
V = 30cm
similarly, \(\frac{U}{V}\) = \(\frac{\text{height of object}}{\text{height of image}}\)
\(\frac{60}{30}\) = \(\frac{3}{h}\)
h = 1.5cm
Source: Myschool Past Questions Archive (Record #28457)