2004 2003 2002 2001 2000
  (Sub-Topics) Screening (%) Mains(%)
  1. Reflection on plane mirrors 0 0
  2. Reflection on curved mirrors 0
  3. Refraction on plane surfaces 3.57 3.33
  4. Total internal reflection 3.57 0
  5. Lenses 0 6.67
  6. Prisms 3.57 0
  7. Interference 3.57 6.67
  Total 14.28 16.67