Light - Session 2. Light...cont. session 1

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Junior Carter
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1 Light...cont session 1

3 What is bioluminescence? the biochemical emission of light by living organisms such as glow-worms, deep sea fish, fire-flies Some call it living light All bioluminescent organisms use a reaction between an enzyme and a substrate to make light, but different species use different chemicals in the process

4 Light Where does it start?

5 Week 2 - What is light? Literally. We willtouch on the effects of circadian rhythms. How does light affect...?

6 Visible Light Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light. This portion of electromagnetic visible light is responsible for the sense of sight for humans. Visible light is usually defined as wavelengths in the range of nanometres

7 Visible Light The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nm

8 Visible Light Isaac Newton discovered that prisms could disassemble and reassemble white light Newton observed that, when a narrow beam of sunlight strikes the face of a glass prism at an angle, some is reflected and some of the beam passes into and through the glass, emerging as different-colored bands. Newton divided the spectrum into seven named colors: red, orange, yellow, green, blue, indigo, and violet.

$Visible Light A Rainbow is an arch of colours visible in the sky, caused by the refraction and dispersion of the sun s light by rain or$

9 Visible Light A Rainbow is an arch of colours visible in the sky, caused by the refraction and dispersion of the sun s light by rain or other water droplets in the atmosphere. The colours of the rainbow are generally said to be red, orange, yellow, green, blue, indigo, and violet.

10 Visible Light The Dark Side of the Moon is the eighth album by the English rock band Pink Floyd

11 Visible Light Infrared Light is the visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nm

Visible Light Ultraviolet light is a form of radiation which is not visible to the human eye. It s in an invisible part of the electromagnetic spectrum.

12 Visible Light Ultraviolet light is a form of radiation which is not visible to the human eye. It s in an invisible part of the electromagnetic spectrum. Radiated energy, or radiation, is given off by many objects: a light bulb, a crackling fire, and stars are some examples of objects which emit radiation.

13 How does our eye see Visible Light

14 Visible Light Colour Photoreceptor Cells Cone Cells are responsible for colour vision S - small (blue) M - medium (green) L - long (red) In humans, there are three types of cones sensitive to three different spectra, resulting in trichromatic color vision.

Normal Colour Vision Red Blindness, Protanopia Blue Blindness, Tritanopia Green Blindness, Deuteranopia Trichromatic Vision; there are three receptors in

15 Normal Colour Vision Red Blindness, Protanopia Blue Blindness, Tritanopia Green Blindness, Deuteranopia Trichromatic Vision; there are three receptors in the retina that are responsible for colour vision. One receptor is sensitive to Green, another to the colour blue and the third to the colour red.- Cones

16 Visible Light Colour When this image is viewed in its full size; 1000 pixels wide, it contains 1 million pixels, each of a different color. The human eye can distinguish about 10 million different colors

Light - Session 2 Photoreceptor Cells Cone Cells are responsible for colour vision Photopic vision is the vision of the eye under well-lit conditions.

17 Light - Session 2 Photoreceptor Cells Cone Cells are responsible for colour vision Photopic vision is the vision of the eye under well-lit conditions. Rod Cells are responsible for low light level vision Scotopic vision is the vision of the eye under low light conditions. Ganglion Cells are particularly sensitive to the absorption of short-wavelength visible light

Mesopic vision is where both the rods and cones are functioning. The lower light level allows the rod to replenish the light sensitive rhodopsin and begin functioning.

18 Photopic vision is the vision of the eye under well-lit conditions. Only Cones are in functioning fully as the rods bleach out quickly in brightly lit environments such as a cloudless sky on the beach. Mesopic vision is where both the rods and cones are functioning. The lower light level allows the rod to replenish the light sensitive rhodopsin and begin functioning. The cone receptors (red, green and blue) still have enough light to provide some amounts of color vision. This occurs in moderately low light levels like right after sunset such as twilight. Scotopic vision is the vision of the eye under low light conditions. Only the Rods are functioning as the cones no longer have enough light to respond, and so we no longer see color

19 Human Circadium Rhythm aka Body Clock Also referred to as the body clock The circadian rhythm is a cycle that tells our bodies when to sleep, rise, eat. It regulates many physiological processes. This internal body clock is affected by environmental cues, like sunlight and temperature.

20 Human Circadium Rhythm

21 Human Circadium Rhythm Blue light suppresses the production of Melatonin

22 Human Circadium Rhythm Melatonin involved in the sycronisation of the circadian rhythms of physiological functions including sleep timing the primary function is regulation of day-night cycles Human melatonin production decreases as a person ages Cortisol During the day cycles of cortisol levels are found in humans. In humans, the amount of cortisol present in the blood undergoes a day time variation; the level peaks in the early morning (approximately 8 a.m.) and reaches its lowest level at about midnight - 4 a.m., or three to five hours after the onset of sleep. Information about the light/dark cycle is transmitted from the retina to the paired suprachiasmatic nuclei...ganglion Cells.

23 Photoreceptor Cells Photosensitive Ganglion Cells are particularly sensitive to the absorption of short-wavelength (blue) visible light. They communicate information directly to the area of the brain called the suprachiasmatic nucleus (SCN), also know as the central body clock.

24 Human Circadium Rhythm

25 Human Circadium Rhythm The relationship between cortisol and melatonin

26 Correlated Colour Temperature The correlated color temperature (CCT) is a specification of the color appearance of the light emitted by a lamp, measured in degrees Kelvin (K)

27 Correlated Colour Temperature

28 Correlated Colour Temperature k k k

29 Light How does it effect...

30 Shadow

31 Surface

32 reflection

33 texture

34 subtlety

35 stage

36 focus

37 silhouette

38 depth

39 glare

40 vista

41 rhythm

42 Light Next week...

43 Ciel de Paris Tour Maine Montparnasse, 33 Avenue du Maine, Paris

44 Jouin Manku Redesigns Dining at Plaza Athénée Hotel 25 Avenue Montaigne, Paris, France

45 Palais Royal - Serge Lutens 142 Galerie de Valois, Paris, France

46 Cristal Room 1 Place des États-Unis, Paris, France

47 Apple Opéra 12 Rue Halévy, Paris, France

Elephant Paname, Art Center And Dance 10 Rue Volney, 75002

48 Elephant Paname, Art Center And Dance 10 Rue Volney, Paris, France

49 Arab World Institute, Paris, France. Jean Nouvel 1 Rue des Fossés Saint-Bernard, Paris, France

50 Mémorial des Martyrs de la Déportation Allée des Justes de France, Paris, France

51 Le Clos Y 27, Avenue du Maine Paris

52 Memorial de la shoah 17 Rue Geoffroy l Asnier, Paris, France

53 joseph dirand 36 Avenue Montaigne, Paris, France

Plaza Athénée Hotel Cristal Room Ciel de Paris Daniel Buren, Observatory of light Joseph Dirand Palais Royal - Serge Lutens Arab World Institute,

54 Plaza Athénée Hotel Cristal Room Ciel de Paris Daniel Buren, Observatory of light Joseph Dirand Palais Royal - Serge Lutens Arab World Institute, Paris, France. Jean Nouvel Le Clos Y Elephant Paname, Art Center And Dance Apple Opéra Mémorial des Martyrs de la Déportation Memorial de la shoah

55 Daniel Buren Observatory of light Work in situ 8 Avenue du Mahatma Gandhi Bois de Boulogne Paris 9

Chapter 9: Light, Colour and Radiant Energy. Passed a beam of white light through a prism.

Chapter 9: Light, Colour and Radiant Energy Where is the colour in sunlight? In the 17 th century (1600 s), Sir Isaac Newton conducted a famous experiment. Passed a beam of white light through a prism.