The distance between a spherical lens and the image is \( -15 \mathrm{~cm} \). The lens is a. Co...

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The distance between a spherical lens and the image is \( -15 \mathrm{~cm} \). The lens is
a. Concave lens
b. either concave lens or convex lens with object between \( \mathrm{O} \) and \( \mathrm{F} \).
c. either of the two irrespective of the object distance
d. Convex lens
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