A concave mirror has a focal length of 20.9 cm. (a) What is its radius of curvat

Question

A concave mirror has a focal length of 20.9 cm.

(a) What is its radius of curvature?
cm

(b) Locate the image when the object distance is 100 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 100 cm. (Select all that apply.)

real

virtual

upright

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. (Select all that apply.)
real

virtual

upright

inverted

Explanation / Answer

a) radius of curvature = 2f = 41.8 cm

b) Using mirror equation,

1/f = 1/o + 1/i

1/-20.9 = 1/-100 + 1/i

i = -26.42 cm

distance = 26.42 cm to the left of mirror

image : real, inverted

c) using mirror equation

i = 19.17 cm to the right

virtual

upright

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