The part I need help on is b and below. I get the weirdest answer for b for some

Question

The part I need help on is b and below. I get the weirdest answer for b for some reason.

A concave mirror has a focal length of 72.0 cm. (a) What is its radius of curvature? 144

(b) Locate the image when the object distance is 100 cm. ____ cm (Indicate the side of the mirror with the sign of your answer.)

Describe the properties of the image when the object distance is 100 cm.

real, virtual, upright, and/or inverted

(c) Locate the image when the object distance is 10.0 cm. (Indicate the side of the mirror with the sign of your answer.) cm Describe the properties of the image when the object distance is 10.0 cm.

real, virtual, upright, and/ or inverted

Explanation / Answer

1/u + 1/v = 1/f

u = 100 cm

v = ??

f = 72 cm

1/v = 1/f - 1/u

v = + 257.14 cm

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