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[SOLVED] Lens Problem, Help from Anyone! Thank you, I appreciate it very much!
An object is placed 30 mm in front of a lens. An image of the object is located 90 mm behind the lens.
a) What is the focal length of the lens?
b) On an axis (the x-axis) draw the lens at position x=0. draw at least two rays and locate the image to show the situation described above.
1/f = 1/Do + 1/Di
if i use -90mm then f= -45.
Homework Statement
An object is placed 30 mm in front of a lens. An image of the object is located 90 mm behind the lens.
a) What is the focal length of the lens?
b) On an axis (the x-axis) draw the lens at position x=0. draw at least two rays and locate the image to show the situation described above.
Homework Equations
1/f = 1/Do + 1/Di
The Attempt at a Solution
if i use -90mm then f= -45.
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