Question

Rules for obtaining image formed by a concave mirror

Answer 1

1. A ray of light which run parallel to the principal axis, after reflection, passes through the principal focus F of a concave mirror, or appears to pass through the principal focus of a convex.

2. A ray of light passing through the centre of curvature in a concave mirror or a ray of light going towards the centre of curvature of a convex mirror is reflected back along the same path.

3. A ray of light passing through the principal focus of a concave mirror or appearing to pass through the principal focus of a convex mirror becomes parallel to the principal axis after reflection

Answer 2

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☛ The image is formed at that point where at least two reflected rays intersect or appear to intersect.

$\underbrace{\bf\:Rule\:1}$

➥ A ray of light which is parallel to the principal axis of a concave mirror,passes through its focus after reflection from the mirror.

$\underbrace{\bf\:Rule\:2}$

➥ A ray of light passing through the centre of curvature of a concave mirror is reflected back along the same path.

$\underbrace{\bf\:Rule\:3}$

➥ A ray of light passing through the focus of a concave mirror becomes parallel to the principal axis after reflection.

$\underbrace{\bf\:Rule\:4}$

➥ A ray of light which is incident at the pole of a concave mirror is reflected back making the same angle with the principal axis.