Question

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.(Delhi - 2015)

Answer 1

Answer:

Refer to the attachment.

Explanation:

The question is about to draw a simple ray diagram where an object is placed between F and C (F = -10 cm and C = -20 cm; u = -15 cm) in front of a concave mirror.

You just need to label the distances as shown the the ray diagram attached.

The rules I have used here are:

• A ray of light parallel to the principle axis passes through the focus of the concave mirror.
• A ray of light passing through the focus becomes parallel to the principal axis after reflection by a concave mirror.