When all else remains the same, what effect would decreasing the focal have known a convex lens

when all else remains the same, what effect would decreasing the focal have known a convex lens

Explanation:

It would cause the lens to produce only real images

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the assestment will probley apele with cause and effect

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.