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A concave spherical mirror has a radius of curvature of 16.0 cm. Locate the imag

ID: 1375167 • Letter: A

Question

A concave spherical mirror has a radius of curvature of 16.0 cm. Locate the image for each of the following object distances. (Enter 0 for M and the distance if no image is formed.)

(a) do = 32.0 cm
M = ______ ,
di = ____ cm, and

what Orientation ?--- (in front of the mirror, real, and upright) OR (in front of the mirror, real, and inverted) OR (behind the mirror, virtual, and upright) OR (behind the mirror, virtual, and inverted) OR (no image is formed)

(b) do = 16.0 cm
M = ______ ,
di = _______ cm, and  ---

What Orientation?--- (in front of the mirror, real, and upright) OR (in front of the mirror, real, and inverted) OR (behind the mirror, virtual, and upright) OR (behind the mirror, virtual, and inverted) OR (no image is formed)

(c) do = 8.0 cm
M =_______ ,
di =________ cm, and  ---

What Orientation?--- (in front of the mirror, real, and upright) OR (in front of the mirror, real, and inverted) OR (behind the mirror, virtual, and upright) OR (behind the mirror, virtual, and inverted) OR (no image is formed)

Explanation / Answer

As R = 16.0 cm, then f = R/2 = 8.0 cm.

Note that      
      
1/f = 1/do + 1/di      
      
where      
      
f = focal length =    8   cm
do = object distance =    32   cm
di = image distance      
      
Thus, solving for di,      
      
di =    10.66666667   cm
      
Thus, the magnification, m = -di/do,      
      
m =    -0.333333333  
**********************************

Note that      
      
1/f = 1/do + 1/di      
      
where      
      
f = focal length =    8   cm
do = object distance =    16   cm
di = image distance      
      
Thus, solving for di,      
      
di =    16   cm
      
Thus, the magnification, m = -di/do,      
      
m =    -1  
**********************************

Note that      
      
1/f = 1/do + 1/di      
      
where      
      
f = focal length =    8   cm
do = object distance =    8   cm
di = image distance      
      
Thus, solving for di,      
      
di =    infinity   cm   [no image]
      
Thus, the magnification, m = -di/do,      
      
m =    0

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