2/28/2013

1

Mr. Sudbury Mr. Sudbury

� Reflection is when a wave reaches a boundary between two media, some or all of the wave bounces back.

� The Law of Reflection states Law of Reflection states Law of Reflection states Law of Reflection states that the angle of incidence is equal to the angle of reflection.

� The reflection creates a virtual imagevirtual imagevirtual imagevirtual image. Called a virtual image because the light doesn’t start there.

� In a plane mirror image size and distance is equal to the true size and distance of the object.

� a) convex mirror makes the image appear smaller.

� B) concave mirror makes the image appear larger.

2/28/2013

2

� Newton passed sunlight (white light) through a prism and saw the color spectrum (ROYGBIV).

� The colors we see are from rays of the light reflecting off of the object.

� The color that something appears to be is because it reflects that λ of light.

� RefractionRefractionRefractionRefraction – The change in direction of a wave as it crosses a boundary between two media in which the wave travels at different speeds.

� When light waves travel through a different When light waves travel through a different When light waves travel through a different When light waves travel through a different medium. Their speed changes, so they bend.medium. Their speed changes, so they bend.medium. Their speed changes, so they bend.medium. Their speed changes, so they bend.

2/28/2013

3

� The separation of light into colors according to their frequency.

� Rainbows

� EM Spectrum (freq, wavelenght)

� Velocity

� Transparent vs opaque

� Diffraction

� Rays

� Polarization

� Color

� Reflection

� Refraction