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UNIT 5. LIGHT   Presentation by  Liannette Bellido Cintrón Natural Sciences 2˚ ESO I.E.S. FRANCISCO RODRÍGUEZ MARÍN FEBRARY 2011
WHAT IS LIGHT? ,[object Object],[object Object]
Electromagnetic waves are classified according to frequency as shown in the diagram below: Light is the radiation of the electromagnetic spectrum that we can capture with our eyes.
SPEED OF LIGHT ,[object Object],[object Object],[object Object],[object Object],Nothing in nature can go faster than the speed of light.
Properties of light ,[object Object],[object Object],[object Object],[object Object]
SHADOWS ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],Shadow Shadows and Penumbras
SOLAR ECLIPSE ,[object Object]
TYPES OF SOLAR ECLIPSES fa There are four types of solar eclipses: ,[object Object],[object Object]
[object Object],[object Object]
LUNAR ECLIPSE ,[object Object],[object Object],[object Object]
SOLAR ECLIPSE vs LUNAR ECLIPSE ,[object Object],[object Object]
[object Object],[object Object],Reflection normal
The laws of reflection  are as follows : 1.The incident ray, the reflected ray and the normal are in the same plane perpendicular to the reflective surface.   2.The angle of incidence is equal to the angle of reflection. Normal
Why do we see objects? We can see objects around us because light the reflected in them reaches our eyes. There are two types of light reflection:
Light Refraction The refraction of light is the change of direction experienced by light rays passing from one medium to another in which they propagate with different speed.  For example, when passing from air to water, the light is refracted.
[object Object],[object Object],[object Object]
The dispersion of light, a demonstration of refraction  ,[object Object]
LENSES ,[object Object],[object Object],[object Object],[object Object]
Types of simple lenses ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
PRIMARY COLOURS OF LIGHT Red, blue, and green are the primary colors of light. Mixing these colors can produce all of the colors of the spectrum. The secondary colours of light are yellow, magenta and cyan.  By mixing: Red + green    yellow Red+ Blue    magenta Green + Blue   cyan  
TRANSMISSION OF COLOUR BY TRANSPARENT AND COLOURED OBJECTS ,[object Object],If we see an object through a coloured crystal, the colour we see the object depends on its original colour and on the crystal’s colour too.
An “emmetropic” eye is one that is able to focus on both far and near objects. But there are some defects associated with the vision: Defects of vision Myopia : A problem with the focusing ability of the eye. It is when the eye is not able to focus properly on objects in the distance. It happens when the cornea becomes a different shape (too curved) from normal or when the eye is longer than normal and so causes light entering the eye to focus on a point within the eye before the retina. This causes the eye and brain to see the image of the distant object as a blurred image. Diverging lens are used to correct the condition.
Hypermetropia: The eyeball is shorter than normal and the image of nearby objects is formed behind the retina. People with the condition have problems focusing nearby objects. It can be corrected using converging lenses. Astigmatism: a very common defect is due to deformities in the curvature of the cornea. The vision is not clear.

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Unit 5. light

  • 1. UNIT 5. LIGHT Presentation by Liannette Bellido CintrĂłn Natural Sciences 2˚ ESO I.E.S. FRANCISCO RODRÍGUEZ MARÍN FEBRARY 2011
  • 2.
  • 3. Electromagnetic waves are classified according to frequency as shown in the diagram below: Light is the radiation of the electromagnetic spectrum that we can capture with our eyes.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14. The laws of reflection are as follows : 1.The incident ray, the reflected ray and the normal are in the same plane perpendicular to the reflective surface. 2.The angle of incidence is equal to the angle of reflection. Normal
  • 15. Why do we see objects? We can see objects around us because light the reflected in them reaches our eyes. There are two types of light reflection:
  • 16. Light Refraction The refraction of light is the change of direction experienced by light rays passing from one medium to another in which they propagate with different speed. For example, when passing from air to water, the light is refracted.
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22. PRIMARY COLOURS OF LIGHT Red, blue, and green are the primary colors of light. Mixing these colors can produce all of the colors of the spectrum. The secondary colours of light are yellow, magenta and cyan. By mixing: Red + green  yellow Red+ Blue  magenta Green + Blue  cyan  
  • 23.
  • 24. An “emmetropic” eye is one that is able to focus on both far and near objects. But there are some defects associated with the vision: Defects of vision Myopia : A problem with the focusing ability of the eye. It is when the eye is not able to focus properly on objects in the distance. It happens when the cornea becomes a different shape (too curved) from normal or when the eye is longer than normal and so causes light entering the eye to focus on a point within the eye before the retina. This causes the eye and brain to see the image of the distant object as a blurred image. Diverging lens are used to correct the condition.
  • 25. Hypermetropia: The eyeball is shorter than normal and the image of nearby objects is formed behind the retina. People with the condition have problems focusing nearby objects. It can be corrected using converging lenses. Astigmatism: a very common defect is due to deformities in the curvature of the cornea. The vision is not clear.

Editor's Notes

  1. La luz es un tipo de radiaciĂłn que se propaga en ondas. Las ondas que pueden propagarse en el vacĂ­o se llaman ondas electromagnĂŠticas. La luz es la radiaciĂłn electromagnĂŠtica.La luz visible es la luz que le permite ver el color y las formas de los objetos. La luz puede provenir de una fuente natural o una fuente artificial.
  2. La luz viaja en lĂ­nea recta. Se viaja en ondas y no requiere de un medio.La velocidad de la luz sin embargo, no depende del medio.La velocidad de la luz en el vacĂ­o y en el aire es bastante similar, alrededor de 300.000 Km / s.Se toma a la luz tan sĂłlo ocho minutos en viajar desde el Sol a la Tierra.
  3. Se refleja cuando llega a una superficie reflectante.Cambia de direcciĂłn al pasar de un medio a otro (se refracta).
  4. Algo que demuestra la propagaciĂłn lineal de la luz es la formaciĂłn de sombras.Un opaco objeto colocado delante de una fuente de luz va a crear una sombra.Una sombra es la zona oscura donde hay poca o ninguna luz.La sombra tendrĂĄ la misma forma que el objeto de su creaciĂłn, esto se debe a que la luz viaja en lĂ­nea recta.
  5. La refracciĂłn de la luz es el cambio de rumbo experimentado por los rayos de luz que pasa de un medio a otro en el que se propagan con diferente velocidad. Por ejemplo, al pasar del aire al agua, la luz se refracta
  6. Las leyes fundamentales de la refracciĂłn son :El rayo refractado, el incidente y la normal se encuentran en el mismo plano.El rayo refractado se acerca a la normal, ya que pasa de un medio en el que se propaga mĂĄs rĂĄpido que otro que se propaga mĂĄs lentamente. Por otro lado se aleja de la normal cuando se pasa a un medio que se propaga con mayor rapidez.
  7. La luz blanca es una mezcla de colores: si un haz de luz blanca pasa a travĂŠs de un medio dispersante, por ejemplo, un prisma, los colores se separan debido a que tienen diferentes Ă­ndices de refracciĂłn.
  8. Una lente es un dispositivo Ăłptico con simetrĂ­a axial perfecta o aproximada que transmite y refracta la luz, convergentes o divergentes de la viga .Se utilizan para fines muy diferentes: gafas, lupas, binoculares, lentes de cĂĄmaras, telescopios, etcUna lente simple consiste en un solo elemento Ăłptico. Una lente compuesta es un conjunto de lentes simples (elementos) con un eje comĂşn;Las lentes suelen ser de vidrio o plĂĄstico transparente.
  9. Lentes convergentes: Son mĂĄs gruesas en el centro que en los bordes. Los rayos refractados por ellas convergen en un punto llamado la atenciĂłn.Lentes divergentes: Son mĂĄs gruesas en los bordes que el centro. Rayos refractados no convergen en un punto, pero por separado.
  10. Trasmisión DE OBJETOS A TRAVÉS DE LA LUZLos objetos pueden ser transparente, translúcido u opaco. Esto depende de cómo la luz viaja a través de ellos:OBJETOS TRANSPARENTES  que permiten que la luz viaje a través de ellos. Aire, agua, vidrio. objetos translúcidos que absorben un poco de luz y permiten a algunos a viajar a través. Cebolla de papel y vidrio esmerilado. objetos opacos que absorben la mayor parte de la luz que reciben. Ellos no permiten que la luz viajan a través de. Un pedazo de papel oscuro, un trozo de madera, un pedazo de metal.
  11. Rojo, azul y verde son los colores primarios de la luz. La mezcla de estos colores se pueden producir todos los colores del espectro.Los colores secundarios de la luz son amarillo, magenta y cian.Mediante la mezcla de: rojo + verde amarilloRojo + azul magenta Verde + azul cian 
  12. Cuando la luz blanca pasa a travĂŠs de un cristal de color, sĂłlo una parte de esta luz blanca se transmite. Depende del color del objeto. Si vemos un objeto a travĂŠs de un cristal de color, el color que vemos el objeto depende de su color original y el color del cristal tambiĂŠn.
  13. Un "emĂŠtrope" ojo es el que es capaz de centrarse en los objetos lejanos y cercanos. Pero hay algunos defectos asociados con la visiĂłn: MiopĂ­a: Un problema con la capacidad de enfoque del ojo. Es cuando el ojo no es capaz de enfocar correctamente los objetos en la distancia. Esto ocurre cuando la cĂłrnea se convierte en una forma diferente (demasiado curvada) de lo normal o cuando el ojo es mĂĄs largo de lo normal por lo que hace que la luz entra en el ojo para enfocar en un punto dentro del ojo antes de la retina. Esto hace que el ojo y el cerebro para ver la imagen del objeto distante como una imagen borrosa. Lente divergente nos ha de corregir la condiciĂłn.
  14. HipermetropĂ­a: El globo ocular es mĂĄs corto de lo normal y la imagen de los objetos cercanos se forma detrĂĄs de la retina. Las personas con esta condiciĂłn tienen problemas para enfocar objetos cercanos. Se puede corregir con lentes convergentes.Astigmatismo: un defecto muy comĂşn es debido a deformidades en la curvatura de la cĂłrnea. La visiĂłn no es clara.