Wave nature of light

Question 1

Dispersion

Answer 1

separating out of the different wavelengths present in light

Question 2

Recombination

Answer 2

second prism will recombine the constituents of white light to again form white light

Question 3

Primary colours

Answer 3

Red, Green, Blue

Question 4

Secondary colours

Answer 4

2 primary colours of equal intensity are mixed

Question 5

Complementary colours

Answer 5

Primary and secondary colour = white

Question 6

Electromagnetic spectrum

Answer 6

Act as a wave

C = F(lambda)

also known as electromagnetic radiation

Question 7

UV light/radiation

Answer 7

Red - violet

cause some substances to fluoresce ( vaseline)
effects photographic light
causes sunburn, harmful to eyes, skin cancer
produces vitamin d in skin
can cause photoemission

Question 8

Infrared light

Answer 8

longer than red therefore not visible
radiated heat
heat proportional to IR radiation
detected using blackened thermometer bulb

Question 9

properties of IR

Answer 9

Pass through fog and mist
causes substances it falls on to heat up
Photograph in darkness