refraction. how can we see transparent objects? reflection & refraction
TRANSCRIPT
How can we see transparent objects?
Air
Water
The Kingfisher• Refraction of light is the bending of light rays at the interface of dissimilar substances
Refraction
Air – lower refractive index
Water – higher refractive index
The Kingfisher•When light is passing from a higher refractive substance into a lower refractive substance the light rays bend away from the perpendicular to the surface.
perpendicular
Refraction
Air – lower refractive index
Water – higher refractive index
The Fish•When light is passing from a lower refractive substance into a higher refractive substance the light rays bend toward the perpendicular to the surface.
perpendicular
Refraction
Air – lower refractive index
Glass – higher refractive index
Glass Window
Air – lower refractive index
Refraction
•Light passing through a transparent material exits at the same angle it enters
Lens
ApplicationRefraction
Lenses
Refraction
•Refraction of light is the bending of light rays at the interface of dissimilar substances
•When light is passing from a higher refractive substance into a lower refractive substance the light rays bend away from the perpendicular to the surface.
•When light is passing from a lower refractive substance into a higher refractive substance the light rays bend towards the perpendicular to the surface.
•The angle at which the light is bent depends on the Refractive Indices of the two substances
Refraction•Who to - Key Stage 3
•Objective – Light behaviour in different transparent materials. Concept of refraction. How it behaves in different materials. Interpretation of everyday experiences.
•What they know – Light reflection, opacity, transparency, basic lenses.
•Format – 10 min presentation as introduction to subject with class discussions.
•Skills – Problem solving, experimental controls, observation, interpretation, application.
•What next – Practical investigation with different materials. Calculation of angles of deflection and Refractive Indices