Q. 523.5( 10 Votes )

Calculate the mag

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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