Skip to content

Course home

Sign up

3.2 Light

EasyMedium
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133
Question 33

A ray of light in air is directed at the sloping face of a triangular glass prism, refracts into the glass, and then meets the horizontal base of the prism at the critical angle.

Let:

  • i i\,i be the angle of incidence at the sloping face,
  • r r\,r be the angle of refraction at the sloping face,
  • c c\,c be the critical angle at the horizontal base.

Which statement correctly describes how these three angles must be measured?

A
  • iii is the angle between the incident ray and the sloping face.
  • rrr is the angle between the refracted ray and the normal to the sloping face.
  • ccc is the angle between the ray inside the prism and the horizontal base.
B
  • iii is the angle between the incident ray and the normal to the sloping face.
  • rrr is the angle between the refracted ray and the normal to the sloping face.
  • ccc is the angle between the ray inside the prism and the vertical normal to the horizontal base.
C
  • iii is the angle between the incident ray and the normal to the sloping face.
  • rrr is the angle between the refracted ray and the sloping face.
  • ccc is the angle between the ray inside the prism and the vertical normal to the horizontal base.
D
  • iii is the angle between the incident ray and the sloping face.
  • rrr is the angle between the refracted ray and the sloping face.
  • ccc is the angle between the ray inside the prism and the horizontal base.
Markscheme

3.2 Light Questions

  1. IGCSE
  2. /Physics
  3. /3.2 Light

216 exam-style questions on CIE IGCSE Physics 3.2 Light, covering 3.2.1a Reflection of light, 3.2.1b Images in a plane mirror, 3.2.2 Refraction of light, 3.2.2a Refraction of light, 3.2.2b Total internal reflection, 3.2.2c Refractive index and critical angle, 3.2.2d Optical fibres, 3.2.3a Converging and diverging lenses, 3.2.3b Ray diagrams and the nature of images, 3.2.3c Virtual images and the magnifying glass, 3.2.3d Correcting long-sightedness and short-sightedness, and 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank