Physics
Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?

-12.33 diopters
12.33 diopters
4.33 diopters
-4.33 diopters

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Physics
In the process of magnetisation of a bar

Only the ends of the bar get magnetised
The entire bulk of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the surface of the bar gets magnetised

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