Lauren M.

asked • 05/10/24

Image height and position-DIVERGING lens

A 2.5-cm-tall object is 30 cm in front of a diverging lens that has a -15 cm focal length.


  1. Calculate the image position.
  2. Calculate the image height.

1 Expert Answer

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Yefim S. answered • 05/10/24

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  1. -1/15 = 1/30 + 1/f ; f = -10 cm (image in front of lens and strait)
  2. h/2.5 = 10/15; h = 25/15 = 5/3 cm = 1.67 cm
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Lauren M.

Thank you for your help! The second part (the 1.67 cm) seems to be incorrect for some reason. The first part is correct. I am just a bit confused.
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05/11/24

Emily W.

It just should be compared to h_o instead of the focal length for #2. h/2.5 = 10/30 --> h= 0.833 cm
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05/12/24

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