Light travels in straight lines When an object is held between a point source of light and a screen, a shadow is formed. If a line is drawn (representing a light ray) joining the light source, the top of the object, and the top of the shadow, this line is straight. 3. Light can be reflected When light strikes a surface, it can bounces back off that surface, Practically every surface reflects some light – if not, we would not be able to see colors. 4.
All lenses have a principal axis which is a line which passes through the middle of the lens. The focal points of all lenses are in front and behind the lens and are where the light rays initially parallel to the principal axis meet. This directly affects the focal length. Factors the affect focal length | How it affects focal length | Thickness | The thicker the lens is the more the light will be refracted creating a shorter focal length. | Medium | Light travels at different speeds in different mediums, as they can be more or less dense.
B. anterior chamber. C. limbus. D. optic disk. Answer Key: C Question 3 of 20 1.0 Points In bright light the muscles of the iris contract, reducing the size of the pupil in order to keep too much light from entering the eye. This process is called: A. mydriasis.
5. What are point and shoot cameras? How do they differ from SLR cameras? Point and shoot cameras are different than SLR cameras because of the mirrors they have. An SLR camera has a semiautomatic mirror, while a point and shoot camera has an optical viewfinder.
For people with just occasional difficulty seeing close up. While most presbyopia these days choose line-free progressive lenses, conventional bifocals and trifocals have some advantages over progressives. In particular, bifocal and trifocal lenses usually provide wider lens areas for reading and computer work than progressive lenses. There are many special-purpose bifocal and trifocal lens designs available, including special glasses for computers for other tasks that require excellent intermediate and near vision. Multifocal eyeglass lenses contain two or more lens powers to help you see objects at all distances after you have the ability to naturally change the focus of your eyes due to presbyopia.
Also velocity of the light in a medium is inversely proportional to the refractive index of that medium. If the refractive index increases, then velocity of the light decreases. Reflection happens when light is returned back from the surface it hits. Incoming and reflected lights have the same angle as the surface. If the surface reflects most of the light then we call such surfaces as mirrors reflective.
Task 1 p3 & p4: Task 3 D2: Since the information is encoded differently in analogue and digital electronics, the way they process a signal is consequently different. All operations that can be performed on an analogue signal such as amplification, filtering, limiting, and others, can also be duplicated in the digital domain. Every digital circuit is also an analogue circuit, in that the behaviour of any digital circuit can be explained using the rules of analogue circuits. The first electronic devices invented and mass produced were analogue. The use of microelectronics has reduced the cost of digital techniques and now makes digital methods feasible and cost-effective such as in the field of human-machine communication by voice.
Do you like to have lenses to make what you see to appear darker or lighter? Oakley has lenses that will do that. They make lenses that you can change out when it’s bright outside or when its cloudy outside. All you have to do is pop your lens out the pop the other
This phenomenon also makes submerged objects, such as fish look closer to the surface than they actually are. Another common example is a rainbow, where sunlight is refracted by raindrops. Sunlight consists of a mixture of different wavelengths, or colors, of light, with blue, for example, having a shorter wavelength than red. When this light passes through raindrops, the shorter wavelengths are bent more than the longer ones, splitting the light into its different colors. Reflection Pretty much everything you see could be considered reflection.
This part is moved slowly across the document with the aid of a belt that is attached to a stepper motor. A stabilizer bar ensures that the scan head does not wobble or deviate in its complete scan pass. - The image of the document is reflected by an angled mirror to another mirror. Each of the mirrors is slightly curved to focus the image it reflects onto a smaller surface. - The last mirror reflects the image onto a lens.