DP Physics (last assessment 2024)
Question 18M.3.SL.TZ1.a
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.SL.TZ1.a |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Calculate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
18M.3.SL.TZ1.a
A ray of light travelling in an optic fibre undergoes total internal reflection at point P.
The refractive index of the core is 1.56 and that of the cladding 1.34.
Calculate the critical angle at the core−cladding boundary.
[1]
Markscheme
«sin c = »
c = 59.2«°»
Accept values in the range: 59.0 to 59.5.
Accept answer 1.0 rad.
[1 mark]
