2004 2003 2002 2001 2000
  (Sub-Topics) Screening (%) Mains(%)
  1. Reflection on plane mirrors 3.33 0
  2. Reflection on curved mirrors 0
  3. Refraction on plane surfaces 3.33 0
  4. Total internal reflection 0 0
  5. Lenses 3.33 0
  6. Prisms 0 0
  7. Interference 3.33 8.33
  Total 13.32 8.33