Lens Unit
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A convex lens forms a virtual image 4 times the size of the object. The distance between object and image is 6?
A convex lens forms a virtual image 4 times
the size of the object. The distance between
object and image is 6.7 cm.
Find the focal length of the lens.
Answer in units of cm.
M = 4 ---> M = di/do
di - do = 6.7 cm
------------------------- : do
M -1 = 6.7/do
4 - 1 = 6.7/do
--> do = 6.7/3 = 2.23 cm
--> di = 6.7 + do = 6.7 + 2.23 = 8.93 cm ( -8.93 cm )---> the virtual image
f = (do * di)/( do + di)
= (2.23* (-8.93)/(2.23 + (-8.93)) = 2.97 cm
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February 11th, 2006 in
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