how can we know that whether the image is above the principal axis or below the principal axis?

Asked by Utkarsh sharma | 15th Oct, 2013, 08:34: PM

Expert Answer:

If the image is real, it is inverted an hence below the principal axis. On the other hand, if the image is virtual, it is erect and hence above the principal axis.

Answered by  | 15th Oct, 2013, 09:15: PM

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