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Posted by on Saturday, April 30, 2011 at 6:22pm.

What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm?
Choose one answer.
a. -13.3 cm
b. 13.3 cm
c. -40.0 cm
d. 40.0 cm

  • physics - , Saturday, April 30, 2011 at 7:03pm

    f = 10 c,

    !/Do + !/Di = 1/f

    Di is the object distance.

    1/40 + 1/Di = 1/f

    1/Di = 1/f - 1/Di = 1/10 - 1/40 = 3/40

    Di = ___ cm

    The object height (4 cm) does not matter when location image location.

  • physics - , Sunday, March 25, 2012 at 11:17am

    1/f=1/v+1/u
    where f=focal length
    v=image distance
    u=object distance
    1/10=1/v+1/40
    1/10-1/40=3/40
    3/40=1/v cross multiply
    3v/3=40/3 divide both sides by 3
    v=13.3 cm

  • physics - , Sunday, May 20, 2012 at 12:55pm

    suppose you place a 5.0cm tall spring in front of a concave mirror. the mirror has a focal length of 24cm. the spring forms an image that appears to be at the same position as the spring,but the image is inverted. where did you place the spring? how tall is the springs image?

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