Reflection through Concave Mirror - Ray Optics - eSaral

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Reflection through the concave mirror:

F = Principal focus

P = Pole of mirror

C = Centre of curvature.

PC = Radius of curvature.

PF = Focal length.

When a narrow beam of light traveling parallel to the principal axis is incident on the reflecting surface of the concave mirror, the beam after reflection converges at a point on the principal axis.

Rules for ray diagrams:

1. When a ray falls in the direction of the center of curvature of the mirror then it reflects back along the same path.
2. A ray, parallel to the principal axis will after reflection, pass through the focus.
3. A ray, passing through the focus is reflected parallel to the principal axis.

Image formed by the concave mirror:

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