An object is placed 25 cm to the left of a lens of focal length 20 cm. Where does the final image form?

Posted on August 31, 2009 by admin

An object is placed 25 cm to the left of a lens of focal length 20 cm. 75 cm to the right of this lens is a plane mirror. Where does the final image form?

Without the mirror, di = 1/(1/f-1/do) = 100 cm. With the mirror at 75 cm, the converging rays are reflected back to form the image at 50 cm.

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One Response to An object is placed 25 cm to the left of a lens of focal length 20 cm. Where does the final image form?

  1. kirchwey says:
    September 1, 2009 at 3:27 am

    Without the mirror, di = 1/(1/f-1/do) = 100 cm. With the mirror at 75 cm, the converging rays are reflected back to form the image at 50 cm.
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