question_answer

To construct a ray diagram we use two rays of light which are so chosen that it is easy to determine their directions after reflection from the mirror. Choose these two rays and state the path of these rays after reflection from a concave mirror. Use these two rays to find the nature and position of the image of an object placed at a distance of 15 cm from a concave mirror of focal length 10 cm.

Answer:

(i) A ray parallel to the principal axis, after reflection will pass through the principal focus of a concave mirror.

(ii) A ray passing through the centre of curvature of a concave mirror, after reflection is reflected back along the same path.

The nature of the image is real and inverted and the position of the image is beyond C.