Alens with focal length +12 mm has an object 5 mm away from it that is 3 mm tall. how far from the lens is the image formed, is it virtual or real, and how tall is the image?

8.57 mm far from lens

image is virtual and height is 1.714 mm

Explanation:

given data

focal length f = 12 mm

object distance p = 5 mm

tall  = 3 mm

to find out

How far from the lens and is it virtual or real and  tall is the image

solution

we apply here lens formula

1/f = 1/p + 1/q

put all value and find q

1/12 = 1/5 + 1/q

q = 8.57 mm

so 8.57 mm far from lens

and

M = - q / p

M = - 8.57 / 5

M = - 1.714

so image is virtual and height is 1.714 mm

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