Drills on Color Addition and Subtraction

If an object absorbs green and is illuminated by white light, what does it appears? Given: La = Green L = White Required: Lr = ? Solution: Lr = L – La = W – G = RBG – G = Magenta

If two lights, blue and red illuminates an object that absorbs red, what is the color of the object? Given: La = Red L = Red and Blue Required: Lr = ? Solution: Lr = L – La = RB – R = B = Blue

Electromagnetic Spectrum

Reflection Is the turning back of light into the same medium after striking a surface

Refraction Is the bending of light when it passes from one medium to another at different speeds

Transparent Body Objects that allow light to pass through it

Opaque Body Objects that does not transmit light at all

Dispersion of Light by a Prism Light at different color travels at different speed Refraction is inversely proportional to wavelength

Diffraction Grating The bending of light around an obstacle and subsequent spreading of light waves into the region behind the obstacle