Sound and LightSection 3 EQ: How can the phenomena of reflection, refraction, interference, and diffraction be explained?

Sound and LightSection 3 Reflection of Light How do objects interact with incoming light?

Sound and LightSection Reflection of Light Objects reflect, absorb, and transmit light.

Sound and LightSection Reflection of Light light ray: a line in space that matches the direction of wave travel or the path of photons.

Sound and LightSection Reflection of Light, continued geometrical optics: the study of light in cases in which light behaves like a ray

Sound and LightSection Reflection of Light, continued ray diagrams: geometrical drawings that use light rays to trace the path of light when describing reflection and refraction

Sound and LightSection Reflection of Light, continued Rough surfaces result in diffuse reflection of light in random directions

Sound and LightSection Reflection of Light, continued Smooth surfaces reflect light rays in one direction.

Sound and LightSection Reflection of Light, continued law of reflection: the angle of incidence equals the angle of reflection

Sound and LightSection 3 When light hits a smooth surface, the angle of incidence (  ) equals the angle of reflection (  ′). The Law of Reflection

Sound and LightSection 3 Mirrors How can you see an image in a mirror?

Sound and LightSection Mirrors, continued A virtual image, formed by flat mirrors is an image from which light rays appear to diverge, even though they are not actually focused there; a virtual image cannot be projected on a screen.

Sound and LightSection Mirrors, continued Both convex mirrors that curve out and concave mirrors that curve in can distort images because the surface is not flat and the line perpendicular to the normal points in different directions for different parts of the mirror.

Sound and LightSection Mirrors, continued Concave mirrors, used to focus reflected light, form a virtual image behind the mirror and a real image in front of the mirror.

Sound and LightSection Mirrors, continued real image: an image that is formed by the intersection of light rays; a real image can be projected on screen.

Sound and LightSection 3 Seeing Colors Why do we see colors?

Sound and LightSection Seeing Colors The colors that you perceive depend on the wavelengths of visible light that reach your eyes.

Sound and LightSection Seeing Colors White light from the sun actually contains light from the visible wavelengths of the electromagnetic spectrum.

Sound and LightSection Seeing Colors, continued –additive primary colors: red, green, and blue Mixing light of the three additive primary colors makes white light.

Sound and LightSection Seeing Colors, continued –subtractive primary colors: yellow, cyan, and magenta If filters or pigments of all three colors are combined in equal proportions, all visible light is absorbed resulting in black which is the absence of color