A concave lens forms the image of an object such that the distance between the object and image ....

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A concave lens forms the image of an object such that the distance between the object and image is 10 \( \mathrm{cm} \) and the magnification produced is \( 1 / 4 \). The
\( \mathrm{P} \)
focal length of the lens will be
(1) \( 8.6 \mathrm{~cm} \)
(2) \( 6.2 \mathrm{~cm} \)
(3) \( 10 \mathrm{~cm} \)
(4) \( 4.4 \mathrm{~cm} \)


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