1. Hi everyone I got another problem for you.
Any way i've been trying to figure this question out for the past hour
A girl wants to see her tear duct by looking into a concave mirror, with a focal point of 1m and she wants the magnification of her tear duct to be 4.
So I've been re-aranging the formulas but still dont get it.
M=4
f=1m
u=?

1=1+1
f ~v~u

and

M=|v|
~~|u|

Don't pay attention to the ~ i just put it there for spacing.
Thanks

2.

3. Been a while since ive done this type of question but this is what i get:

1/f = 1/u + 1/v => 1 = 1/u + 1/v

But 4 = v/u => v = 4 u which gives that 1 = 1/u (1 + 1/4)

i.e. u = 5/4 and v = 5

I cant remember if this is right though - but thats the maths for the equations you gave.

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