A student investigates the refraction of a ray of light passing through a rectangular transparent block.
The student draws a line perpendicular to the surface of the block at the point of entry EEE of the ray. State the term used for this perpendicular line.
Using the ray-trace sheet, the student measures the following quantities:
Calculate the value of dl\frac{d}{l}ld.
Given that the angle of incidence is θ=45∘\theta = 45^\circθ=45∘, the refractive index nnn of the block can be calculated using the equation:
n=0.707×lL n = 0.707 \times \frac{l}{L} n=0.707×LlCalculate the refractive index nnn of the block, giving your answer to 2 decimal places.
Suggest how the student can adapt this experiment to check if the value of dl\frac{d}{l}ld is reproducible.
State one practical source of inaccuracy in this ray-tracing experiment, even if it is carried out very carefully.
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.