An object is held 26.3 cm away from a lens. The lens has a focal length of 18.5

Question

An object is held 26.3 cm away from a lens. The lens has a focal length of 18.5 cm.

a.) Determine the image distance.
____cm

b.) Determine the magnification.
____

c.) If the object is 7.2 cm long, determine the image height.
_______cm


d.) Which of the following are true about the image? Choose all that apply.
The image is inverted.
The image is virtual.
The image is upright.
The image is real.

e.) Which of the following are true about the lens? Choose all that apply.
The lens is convex.
The lens is concave.
The lens is diverging.
The lens is converging.

Explanation / Answer

a)

1/q = 1/f - 1/p = 1/18.5 - 1/26.3

q = 62.4 cm

b)

m = q/p = 62.3782/26.3 = 2.37

c)

h' = mh = 2.3718 * 7.2 = 17.1 cm

d)

The image is inverted.

The image is real.

e)

The lens is convex.

The lens is converging.

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