Physics Review QuestionUnit:
Geometric opticsYear:
1995 Question#:
87Question:
A concave mirror has a radius of curvature of 0.60 meter. When an object is placed
0.40 meter from the reflecting surface, the image distance will be(1
) 0.10 m (2
) 0.20 m (3
) 0.83 m(4
) 1.2 mWhat is this question really asking?
Explanation by: Chris [ Return to question menu
]Answer 1
0.10 m INCORRECT This would be the answer if you you subtracted the object distance from .3, the focal radius. Remember to use the equation 1/di+1/do=1/F. Using the reciprocals of the numbers above will yield the right answer. return to top
Answer 2
0.20 m INCORRECT Subtracting the object distance from the radius of curvature is not the way to find the right answer. return to top
Answer 3
0.83 INCORRECT .83 is incorrect return to top
Answer 4
1.2 m CORRECT Radius of curvature=2f Focal length=f Focal length=Radius of curvature/2 f=.6/s f=.3m solve for the image distance return to top
What's this question really asking?
This question is asking how far an image of an object will appear from the mirror in a concave mirror. return to top |

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