An image \( Y \) is formed of point object \( X \) by a lens whose optic \( \mathrm{P} \) axis i...

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An image \( Y \) is formed of point object \( X \) by a lens whose optic
\( \mathrm{P} \) axis is \( A B \) as shown in figure.

W
Draw a ray diagram to locate the lens and its focus. If the image \( Y \) of the object \( X \) is formed by a concave mirror (having the same optic axis as \( A B \) ) instead of lens, draw another ray diagram to locate the mirror and its focus. Write down the steps of construction of the ray diagrams.
\( (1994,6 \mathrm{M}) \)
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