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# The Eye and the Camera **A. Completing Sentences** Your eye works by *reflecting* light from an object and *focusing* it. The pupil *controls* the amount of light that enters the eye by expanding and contracting and the retina *forms* a real, inverted, smaller image which is sent to the brain...
# The Eye and the Camera **A. Completing Sentences** Your eye works by *reflecting* light from an object and *focusing* it. The pupil *controls* the amount of light that enters the eye by expanding and contracting and the retina *forms* a real, inverted, smaller image which is sent to the brain through the optic nerve. Chemical reactions occur which send signals to the brain. Digital cameras have a similar principle in forming images. **B. Matching Parts with Function** | Part | Function | |----------------|---------------------------------------------------------------------------------| | Object | Light reflected from this enters the eye. | | Cornea and Lens| Focus the light. | | Iris | Controls the size of the pupil, allowing in more or less light. | | Pupil | A hole that allows light to enter the lens. | | Retina | Where the image forms, contains photoreceptors. | | Photoreceptors | Rods and cones, absorb light, causing a chemical reaction to produce an electrical signal. | | Image | Real, inverted, smaller than the object. | | Optic Nerve | Sends electrical signal to the brain. | **C. How the Eye Forms an Image** The eye forms a real, inverted, and smaller image on the retina. Light from an object is reflected and focused by the cornea and lens onto the retina. The image formed on the retina is inverted, but since signals are processed in the brain to create a non-inverted visual, the brain gives the final image in the correct orientation. **D. Comparing a Simple Camera with the Eye** Both the eye and a simple camera use light to form an image. In the eye, light causes chemical reactions that create electrical signals. In cameras, light causes electrical changes in pixels to form an image. The eye processes the image in a way that the image is not inverted for the observer, and the eye uses light as a stimulus to create an image.