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Trayi Goyal
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Asked: 2020-10-20T12:21:52+00:00 In:

Define the principal focus of a concave mirror.

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NCERT Solution for Class 10 Science Chapter 10
Light – Reflection and Refraction
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-168
Questions No-1

2020-2021cbsechapter 10class10light – reflection and refractionncertscience
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    4 Answers

    1. Light rays that are parallel to the principal axis of a concave mirror converge at a specific
      point on its principal axis after reflecting from the mirror. This point is known as the
      principal focus of the concave mirror.

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    2. The principle focus of concave mirror is a point on its principle axis to which all the light rays which are parallel and close to the axis, converge after reflection from the mirror.

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    3. When light rays parallel to the principal axis coming from infinity fall on the surface of the concave mirror, it converges at a single point on the principal axis. This point is called ‘Principal Focus of concave mirrors. The principal focus is also referred to as simply focus or focal point. The concave mirror focal point lies in front of the mirror.

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    4. The principal focus of a concave mirror is a point on its principal axis to which all the
      light rays which are parallel and close to the axis, converge after reflection from the concave mirror.

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