Question
A screen is placed exactly one meter away from an illuminated test pattern. A lens placed between them forms a clear (focused) image of the pattern on the screen when the center of the lens is 200 mm from the test pattern. What is the focal length of the lens? ( cm)
Answers
bobpursley
o= 200mm
i=1000-200mm if I understand the description correctly.
1/o+1/i=1/f
1/200+1/800=1/f
f= 200*800/1000= 160mm
i=1000-200mm if I understand the description correctly.
1/o+1/i=1/f
1/200+1/800=1/f
f= 200*800/1000= 160mm