Page 278 - text book form physics kssm 2020

Guide to Drawing Spherical Mirror Ray Diagrams
Look at the guide in Table 6.13 to draw ray diagrams of spherical mirrors.

Table 6.13 Guide on drawing ray diagrams of spherical mirrors

Concave mirror Convex mirror

1. Light ray passing through C is refl ected back 1. Light ray travelling towards C is refl ected back
to its original path. to its original path

Principal axis Principal axis
C F P P F C

2. Light ray parallel to principal axis is refl ected 2. Light ray parallel to principal axis is refl ected
to the focal point, F. as if it originates from the focal point, F.

Principal axis Principal axis
C F P P F C

3. Light ray passing through F is refl ected parallel 3. Light ray travelling towards F is refl ected
to the principal axis. parallel to the principal axis.

Principal axis Principal axis
C F P P F C

SMART INFO
SMART

Radius of curvature of
mirror, r is two times the
focal length of the spherical
mirror, f, that is r = 2f.

272
272 6.6.1
6.6.1