A concave mirror can be used to produce a parallel beam of light if a…

A concave mirror can be used to produce a parallel beam of light if a lighted bulb is placed
  • A.
    between its focus and the pole
  • B.
    at its focus
  • C.
    at its centre of curveture
  • D.
    between its focus and centre of curvature
Correct Answer: Option B
Explanation
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