Hey everyone, I am having problems understanding this question. Any help would b

Question

Hey everyone,

I am having problems understanding this question. Any help would begreatly appreciated. Thanks! -A

Each student in physics lab is assigned to find the location wherea bright object may be placed in order that a concave mirror withradius of curvature r = 40cm will produce an image three times thesize of the object. Two students complete the assignment atdifferent times using identical equipment, but when they comparenotes later, they discover that their answers for the objectdistance are not the same. Explain why they do notnecessarily need to repeat the lab, and justify your response witha calculation.
Hey everyone,

I am having problems understanding this question. Any help would begreatly appreciated. Thanks! -A

Each student in physics lab is assigned to find the location wherea bright object may be placed in order that a concave mirror withradius of curvature r = 40cm will produce an image three times thesize of the object. Two students complete the assignment atdifferent times using identical equipment, but when they comparenotes later, they discover that their answers for the objectdistance are not the same. Explain why they do notnecessarily need to repeat the lab, and justify your response witha calculation.

Explanation / Answer

   from the given problem we can see that thetwo students choose different signs for magnification    one upright and one inverted    the focal length of the concave mirroris    f = R / 2      = 40 cm / 2      = ........ cm     we have the relation    m = - di / do    ± 3 = - di /do    di = ........    the mirror equation is given by    (1 / do) + (1 / di)= (1 / f)    solve for do

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