Available online
Description
'The first part of the programme concerns how a particular combination of visible wavelengths reaching the eye is interpreted as a particular colour. Triachromacy is shown to be the basis of colour... vision from Young's overlapping colour experiment and from modern microspectrophotometry of cone cells in the retina. drawbacks of trichromacy as an explanation are illustrated by means of visual illusions. The second part of the programme asks how the combinations of wavelengths seen as a colour are produced in the first place. Absorption of spectral colours by a dye and by cloth coloured with the dye is shown both as a studio demonstration, and instrumentally using a spectrophotometer with an integrating sphere attachment, thus the difference between absorption, transmission and reflection is pointed out. The programme concludes with a case study which explains why a carrot appears orange.'
'The first part of the programme concerns how a particular combination of visible wavelengths reaching the eye is interpreted as a particular colour. Triachromacy is shown to be the basis of colour... vision from Young's overlapping colour experiment and from modern microspectrophotometry of cone cells in the retina. drawbacks of trichromacy as an explanation are illustrated by means of visual illusions. The second part of the programme asks how the combinations of wavelengths seen as a colour are produced in the first place. Absorption of spectral colours by a dye and by cloth coloured with the dye is shown both as a studio demonstration, and instrumentally using a spectrophotometer with an integrating sphere attachment, thus the difference between absorption, transmission and reflection is pointed out. The programme concludes with a case study which explains why a carrot appears orange.'
| Module code and title: | S341, "Photochemistry: light, chemical change and life" |
|---|---|
| Item code: | S341; 03 |
| First transmission date: | 28-03-1982 |
| Published: | 1982 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:25:00 |
| + Show more... | |
| Producer: | Neil Cameron |
| Contributor: | Charles Taylor |
| Publisher: | BBC Open University |
| Keyword(s): | Carrots; Cone cells; Dye; Illusions; Light; Retina; Spectrophotometer; Trichromacy; Wavelengths; Young's overlapping colour experiment |
| Master spool number: | HOU3828 |
| Production number: | FOUS212H |
| Videofinder number: | 2017 |
| Available to public: | no |
