CBSE Class 10 Science 2017 · Paper 531/1 · Question 13
Draw each of the following diagrams on your answer sheet and show the path of ray after reflection.
Answer
The ray at the pole reflects with ; rays towards or through reflect parallel to the principal axis.
(i) The mirror is convex and the ray strikes its pole , where the normal is the principal axis. The reflected ray goes back below the principal axis, making the same angle with the axis as the incident ray: .
(ii) The mirror is convex and the ray is directed towards its principal focus , which lies behind the mirror. After reflection the ray travels parallel to the principal axis, back towards the side it came from.
(iii) The mirror is concave and the ray passes through its principal focus . After reflection the ray travels parallel to the principal axis, back towards the side it came from, below the axis.
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