Where must a light source be placed in front of a concave mirror for (a) light energy to be...

Question:

Where must a light source be placed in front of a concave mirror for (a) light energy to be concentrated to a single point and (b) the light to be reflected in a parallel beam?

Object Positions:


Converging mirror is the concave mirror which is one of the two types of spherical mirrors. The mirror converges the incident light falling on its reflecting part recessed inwards. The mirror forms virtual images for the exceptional case when the object is placed between the optical center and the focus of the mirror.

Answer and Explanation:


  • The light rays are considered to propagate from an infinite distance if the object distance is substantial as compared to the size of the object.
  • The single point concentration of all reflected light from infinity will converge to the focal point of the mirror which is called the focus.
  • If we reverse the aforementioned scenario that is placing the object at the focus of the mirror.
  • We get the reflected beams of light to be parallel to the principal axis appearing parallel beam.

Learn more about this topic:

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Ray Tracing with Mirrors: Reflected Images

from UExcel Physics: Study Guide & Test Prep

Chapter 15 / Lesson 2
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