A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?
A
0.3m
B
3.0m
C
3.5m
D
4.0m
Verified Correct Answer: B.
Physical Principles & Numerical Solution
V = 72m
U = ?, Magnification = 24
But Magnification = V/U
∴ 24 = 72/U
U = 72/24
U = 3.0m
Source: Myschool Past Questions Archive (Record #712)