rules for diverging

Question 1

mirror

Answer 1

1. a ray parallel to the principal axis is reflected as if it has come through the focus (F)
2. a ray aimed at the centre of curvature (C) is reflected back upon itself
3. a ray aimed at the focus (F) is reflected parallel to the principal axis

Question 2

lenses

Answer 2

1. A ray parallel to the principal axis is refracted as if it had come through the principal focus, (F)
2. A ray that appears to pass through the secondary principal focus, (F’), is refracted parallel to the principal axis.
3. A ray through the optical centre, (O), continues straight through without being