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Mirrors

A mirror is a highly reflective surface. The most common mirrors are flat and are known as plane mirrors . Household mirrors are plane mirrors. They are made of a flat piece of glass with a thin layer of silver nitrate or aluminium on the back. However, other mirrors are curved and are either convex mirrors or are concave mirrors . The reflecting properties of all three types of mirrors will be discussed in this section.

Image formation

Image

An image is a representation of an object formed by a mirror or lens. Light from the image is seen.

An object formed in a mirror is real and upright.

If you place a candle in front of a mirror, you now see two candles. The actual, physical candle is called the object and the picture you see in the mirror is called the image. The object is the source of the incident rays. The image is the picture that is formed by the reflected rays.

The object could be an actual source that emits light, such as a light bulb or a candle. More commonly, the object reflects light from another source. When you look at your face in the mirror, your face does not emit light. Instead, light from a light bulb or from the sun reflects off your face and then hits the mirror. However, in working with light rays, it is easiest to pretend the light is coming from the object.

An image formed by reflection may be real or virtual. A real image occurs when light rays actually intersect at the image. A real image is inverted, or upside down. A virtual image occurs when light rays do not actually meet at the image. Instead, you "see" the image because your eye projects light rays backward. You are fooled into seeing an image! A virtual image is erect, or right side up (upright).

You can tell the two types apart by putting a screen at the location of the image. A real image can be formed on the screen because the light rays actually meet there. A virtual image cannot be seen on a screen, since it is not really there.

To describe objects and images, we need to know their locations and their sizes. The distance from the mirror to the object is the object distance , d o .

The distance from the mirror to the image is the image distance , d i .

Plane mirrors

Investigation : image formed by a mirror

  1. Stand one step away from a large mirror
  2. What do you observe in the mirror? This is called your image.
  3. What size is your image? Bigger, smaller or the same size as you?
  4. How far is your image from you? How far is your image from the mirror?
  5. Is your image upright or upside down?
  6. Take one step backwards. What does your image do? How far are you away from your image?
  7. If it were a real object, which foot would the image of you right show fit?
An image in a mirror is virtual, upright, the same size and inverted front to back.

When you look into a mirror, you see an image of yourself.

The image created in the mirror has the following properties:

  1. The image is virtual .
  2. The image is the same distance behind the mirror as the object is in front of the mirror.
  3. The image is inverted front to back.
  4. The image is the same size as the object.
  5. The image is upright.

Questions & Answers

I'm interested in biological psychology and cognitive psychology
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physiological Psychology
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How can I develope my cognitive domain
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Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
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Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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A child is a member of community not society elucidate ?
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Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
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Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
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nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
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I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
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Source:  OpenStax, Siyavula textbooks: grade 10 physical science. OpenStax CNX. Aug 29, 2011 Download for free at http://cnx.org/content/col11245/1.3
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