Light and Sight Study Guide Name/Nombre: ______

Light and Sight Study Guide Name/Nombre: ______Study Jams, Schoolnet, Class Date/Fecha: ______Core/Clase: _____

Light Absorption, Reflection, and Refraction Summary

______light changes direction when it bounces off a shiny, smooth surface like water, a mirror, or even metal. The angle of reflection is the same as the angle of incidence. ______light is bent as it passes from one substance into another. ______light is taken in and not reflected or transmitted.

Seeing (Sight) Summary

Our ______help us to see objects. The eye has many complex parts:  The clear ______, the outer layer that covers and protects the iris and pupil.  The ______is the colorful part of the eye with muscles that adjust the size of the pupil.  The hole in your eye, the ______, gets larger when it is darker to take in more light and smaller when sufficient light is available in order to see an image.  The ______bends light rays that come through the pupil by changing shape to project an upside down image on the retina.  The ______is a lining at the back of the eye with special photoreceptors that converts the image into code that gets taken by the ______to the brain, where the image is turned right side up again.  Identify the parts of the eye. 1. An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light? A. black C. red B. blue D. white 2. Which statement is true about visible light? A. Humans cannot see any light from the electromagnetic spectrum. B. Visible light makes up a small part of the electromagnetic spectrum. C. Visible light has a frequency equal to that of gamma rays. D. Humans can see visible light only as white light. 3. A student observes that a ray of light bends where it passes from glass into water. What best explains this phenomenon? A. The properties of a wave change as it travels from one medium into another. B. The energy of a liquid is greater than that of a solid and increases the amount of light in it. C. The mass of a ray of light varies in proportion with the density of its surroundings. D. A wave consumes energy in a solid but produces energy in a liquid. 4. A beam of light is directed toward a tank filled with water.

What causes the beam of light to change direction? A. change in media C. increase in pressure B. change in altitude D. increase in temperature 5. Light waves that cross from an air medium to a water medium will ____. A. be focused into a straight line C. change length and direction B. lose energy and dissipate D. reflect off the water’s surface 6. The retina is a photosensitive tissue that contains the special photoreceptor cells. What is the purpose of these photoreceptor cells? A. to convert black and white into color C. to invert the image right-side up B. to convert light to electrical impulses D. to focus light waves in the back all of the eye 7. Objects we see can be placed into two categories: luminous objects and illuminated objects. Luminous objects are objects that create light and illuminated objects are objects that reflect light. What is an example of an illuminated object? A. Sun C. flashlight B. fire D. moon 8. A pigment is any substance that absorbs light. The color of the pigment comes from the wavelengths of light reflected. Since chlorophyll is a green pigment, it reflects ____. A. green wavelengths C. yellow and blue wavelengths B. red and blue wavelengths D. all wavelengths except green Light and Sight Study Guide Name/Nombre: ____Answer Key______Study Jams, Schoolnet, Class Date/Fecha: ______Core/Clase: _____

Light Absorption, Reflection, and Refraction Summary

__Reflected____ light changes direction when it bounces off a shiny, smooth surface like water, a mirror, or even metal. The angle of reflection is the same as the angle of incidence. __Refracted____ light is bent as it passes from one substance into another. __Absorbed____ light is taken in and not reflected or transmitted.

Seeing (Sight) Summary

Our __eyes___ help us to see objects. The eye has many complex parts:  The clear __cornea____, the outer layer that covers and protects the iris and pupil.  The __iris___ is the colorful part of the eye with muscles that adjust the size of the pupil.  The hole in your eye, the __pupil___, gets larger when it is darker to take in more light and smaller when sufficient light is available in order to see an image.  The _lens__ bends light rays that come through the pupil by changing shape to project an upside down image on the retina.  The __retina____ is a lining at the back of the eye with special photoreceptors that converts the image into code that gets taken by the ___optic__ _nerve__ to the brain, where the image is turned right side up again.  Identify the parts of the eye. 1. An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light? A. black C. red B. blue D. white 2. Which statement is true about visible light? A. Humans cannot see any light from the electromagnetic spectrum. B. Visible light makes up a small part of the electromagnetic spectrum. C. Visible light has a frequency equal to that of gamma rays. D. Humans can see visible light only as white light. 3. A student observes that a ray of light bends where it passes from glass into water. What best explains this phenomenon? A. The properties of a wave change as it travels from one medium into another. B. The energy of a liquid is greater than that of a solid and increases the amount of light in it. C. The mass of a ray of light varies in proportion with the density of its surroundings. D. A wave consumes energy in a solid but produces energy in a liquid. 4. A beam of light is directed toward a tank filled with water.

What causes the beam of light to change direction? A. change in media C. increase in pressure B. change in altitude D. increase in temperature 5. Light waves that cross from an air medium to a water medium will ____. A. be focused into a straight line C. change length and direction B. lose energy and dissipate D. reflect off the water’s surface 6. The retina is a photosensitive tissue that contains the special photoreceptor cells. What is the purpose of these photoreceptor cells? A. to convert black and white into color C. to invert the image right-side up B. to convert light to electrical impulses D. to focus light waves in the back all of the eye 7. Objects we see can be placed into two categories: luminous objects and illuminated objects. Luminous objects are objects that create light and illuminated objects are objects that reflect light. What is an example of an illuminated object? A. Sun C. flashlight B. fire D. moon 8. A pigment is any substance that absorbs light. The color of the pigment comes from the wavelengths of light reflected. Since chlorophyll is a green pigment, it reflects ____. A. green wavelengths C. yellow and blue wavelengths B. red and blue wavelengths D. all wavelengths except green