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
Correct Answer: Option B
Explanation
V = 72m
U = Magnification = 24
But Magnification = V/U
∴ 24 = 72/U
U = 72/24
U = 3.0m