Question

. The rules for tracing images formed in a concave mirror are:
1. Rule 1 : A ray of light falling on a concave mirror in a direction parallel to the principal axis of the mirror, passes actually trough the principal focus of the mirror after reflection.
2. Rule 2 : A ray of light incident on a concave mirror on passing through centre of curvature of the mirror is reflecting back along the same path, i.e., such a ray retraces its path in opposite direction.
3. Rule 3 : A ray of light incident on a concave mirror on passing through focus of the mirror becomes parallel to principal axis of the mirror, on reflection.
4. Rule 4 : A ray f light incident obliquely towards the pole P of concave mirror is reflected obliquely as per the laws of reflection.
1. When the object is placed at infinity, the image will be formed at:
(a) At pole (b) Between pole and focus
(c) At focus (d) At centre of curvature.
2. When the object is placed beyond the centre of curvature of concave mirror; the image will be formed at:
(a) At pole (b) At the centre of curvature
(c) Between pole and focus
(d) Between focus and the centre of curvature.
3. When the object is placed at the focus of a concave mirror, the image will be formed at:
(a) At infinity (b) At centre of curvature
(c) At focus (d) At pole
4. When the object is placed at the centre of curvature the image will be formed at:
(a) At pole (b) At centre of curvature.
(c) At focus (d) At infinity.

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Answer 1

Answer:

Ans (1) at focus

(2) at the centre of curvature

(3) at pole

(4) at the centre of curvature

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