2004 2003 2002 2001 2000
  (Sub-Topics) Screening (%) Mains(%)
  1. Reflection on plane mirrors 0 0
  2. Reflection on curved mirrors 3.57
  3. Refraction on plane surfaces 0 0
  4. Total internal reflection 0 6.67
  5. Lenses 3.57 3.33
  6. Prisms 0 0
  7. Interference 3.57 0
  Total 10.71 10