An object placed 35 cm away from a lens projects a real image equal to 55...

Question

Question

An object placed 35 cm away from a lens projects a real image equal to 55 cm behind the lens. What is the focal distance of the lens?

For the example above, what is the magnification of the lens?

Not exactly sure what equation to use. Please help, I will rate the best and clearest answer.

Answer 1

Answer #1

Distance from the object to the lens ,d_o= 35 cm

Distance from the image to the lens,d_i=-55 cm, Since on the same side of the lens negative sign is given

We need to find the focal length,

We know that the focal length ,1/f=1/d_o+1/d_i

i.e 1/f=1/35-1/55=0.0103

f=96.25 cm

magnification,m=-distance of the image from lens/distance of the object from the lens

so,m=-(-55)/(35)=1.57

Answer 2

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