The two rays chosen for the construction of ray diagram is:
Ray 1: When the incident ray is parallel to the principal axis, the reflected ray will pass through the focus of concave mirror or it appears to pass through the focus of convex mirror.
Ray 2: When the incident ray passes through or appears to pass through the centre of curvature, the light, after reflection from the spherical mirror, reflects back along the same path.
The image formed is real, inverted, magnified and is formed beyond the centre of curvature.
Ray 1: When the incident ray is parallel to the principal axis, the reflected ray will pass through the focus of concave mirror or it appears to pass through the focus of convex mirror.
Ray 2: When the incident ray passes through or appears to pass through the centre of curvature, the light, after reflection from the spherical mirror, reflects back along the same path.
The image formed is real, inverted, magnified and is formed beyond the centre of curvature.
CBSE DELHI - SET 2 2015
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The candidate may choose any two of the following rays:
- A ray parallel to the principal axis, after reflection, will pass through the principal focus of a concave mirror.
- A ray passing through the principal focus of a concave mirror after reflection will emerge parallel to the principal axis.
- A ray passing through the centre of curvature of a concave mirror after reflection is reflected back along the same path.
- A ray incident obliquely to the principal axis towards the pole of a concave mirror is reflected obliquely, making equal angles with the principal axis.
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