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Real Image vs. Virtual Image- NEED HELP IMMEDIATELY PLEASE RIGHT AWAY!!!!

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Question:

Suebee

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Karma Points: 414

(Howard University)

Date Posted: 5/16/2008 10:12:08 AM Status: Live

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Response:

The sign conventions for thin lens: 1 / d_o + 1 / d_i = 1 / f

* The focal length (f) is positive for a converging lens and negative for a diverging lens.

* The object distance (d_o) is always taken as positive for a single lens.

* The image distance ( d_i ) is positive for a real image ( which is located on the image side

of the lens) and negative for a virtual image (which is located on the object side of the lens ).

* The magnification (M) is positive for an upright image and negative for an inverted image.

It is helpful to sketch a raydiagram before working a lens problem analytically. .. Have a good day..... Suebee.

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