Thin Diverging Lens An object is 10 cm to the left of a thin diverging lens havi

Question

Thin Diverging Lens An object is 10 cm to the left of a thin diverging lens having a 40 cm focal length. What is the image distance i in cm? Find the image position with a ray diagram.

and....

Which of the following is correct?

a) The image is real and on the same side of the lens as the object.

b) The image is virtual and on the side of the lens opposite the object.    

c) The image is virtual and on the same side of the lens as the object.

d) The image is real and on the side of the lens opposite the object.

Explanation / Answer

1/s + 1/s' = 1/f

(1/10) + (1/s') = -1/40

1/s = -1/40 - 1/10

1/s' = -5/40

s' = 40/5

s' = -8 cm

s' = negative

so the image is virtual and on the same side of the lens as the object

option C

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