Question

A lens 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?

Answer 1

8.57 mm far from lens

image is virtual and height is 1.714 mm

Step-by-step 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