answer: 10 cm (I get -10 from the math but thats not one of the choices)
3) I skipped a step but 10 is still the answer.
1) Start with the lens or mirror equation:
1/do + 1/di = 1/f = 1/10
1/30 + 1/di = 1/10
1/di = 2/30
One of your answers is correct, but you used the wrong formula to get it.
di = 15 cm is the distance to the image. It makes no difference what the object height is.
3) wrong. You are just taking wild guesses. That won't do.
1/5 + 1/di = 1/10
1/di = 1/10 - 2/10 = -1/10
di = -10
Magnification = |di/do| = ?
Image size = (object size) * (magnification)= ?
it may look like it but im not
So I was right originally on 3, with 20 cm. For 2, 162/2 = 81 cm
mag = di/do
mag = -10/5.0
mag = 2
im size = o-size * mag
im size = 5.0 * 2
im size = 10
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