By what factor is the image magnified when an object is placed 1.7 focal lengths

Question

By what factor is the image magnified when an object is placed 1.7 focal lengths from a converging lens? Remember that magnification can be either positive or negative. Express your answer using two significant figures. Part B Is the image upright or inverted? You're standing 2.0 m horizontally from the edge of a 4.5 m -deep lake, with your eyes 1.6 m above the water surface. A diver holding a waterproof laser pointer at the lake bottom points the laser so you can see it. Part A If the light in the water makes a 40degree angle with the vertical, at what horizontal distance is the diver from the edge of the lake? Express your answer using two significant figures.

Explanation / Answer

11)
A)
let f is the focal length.

object distance, u = 1.7*f

let v is the image distance.

apply, 1/u + 1/v = 1/f

1/v = 1/f - 1/u

1/v = 1/f - 1/(1.7*f)

v = 2.428*f

so, magnification, M = -v/u

= -2.428*f/(1.7*f)

= 1.428

b) inverted

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