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Question

Object when placed at ________ in front of concave mirror magnification of -1 is obtained.
  1. Infinity
  2. Centre of curvature
  3. Between focus and centre of curvature
  4. Principal focus

A
Infinity
B
Between focus and centre of curvature
C
Centre of curvature
D
Principal focus
Solution
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When the object is put at infinity, then the ray of light will pass from the focus point. So in this case, the object is at infinity position, the magnification will be -1.

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