Answer :

__Given__

Focal length of convex lens = + 10cm (focal length of convex lens is always positive)

Since nearest distance of vision is 25cm

__Formula Used__

Lens Formula

Magnification formula

Now let’s re-write the above formula

Using mirror equation

Now replacing the ‘u’ in magnification equation with the above u we get

Now, according to our sign convention v is negative and equal to D (nearest distance of vision)

Hence the equation becomes

Putting the values, we get

M = 3.5

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