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March 30, 2017

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an object 5 millimeters high is located 15 millimeters in front of a plane mirror. how far from the mirror is the image located?

  • light - ,

    The answer depends upon the focal length of the mirror, not the height of the object. A plane mirror has a focal length of infinity.

    Using the equation
    1/Do + 1/Di = 1/f = 0,
    which you should know by now,
    you will find that Do (the object distance) equals MINUS the image distance, Di.

    Thus the image is 15 mm behind the mirror.

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