Optics Test Review

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Questions and Answers

What happens to a ray of light when it travels from a slow to a fast medium past the critical angle?

  • It reflects back into the slow medium. (correct)
  • It is absorbed by the medium.
  • It bends away from the normal.
  • It continues in a straight line.

The angle of incidence is always equal to the angle of reflection.

True (A)

What are the primary light colors?

Red, Blue, Green

The complementary color to the primary light color red is __________.

<p>cyan</p> Signup and view all the answers

Match the primary light colors with their corresponding secondary colors:

<p>Red = Cyan Green = Magenta Blue = Yellow Yellow = Blue</p> Signup and view all the answers

What type of mirror always produces a virtual image that is smaller than the object?

<p>Convex mirror (C)</p> Signup and view all the answers

Incandescence is a type of light emission from chemical reactions.

<p>False (B)</p> Signup and view all the answers

What is the distance from a mirror to its focal point called?

<p>focal length</p> Signup and view all the answers

Light emitted from living organisms is known as __________.

<p>bioluminescence</p> Signup and view all the answers

Match the terms with their definitions:

<p>Translucent = A material that allows some light to pass through. Specular reflection = Reflection off a smooth surface. Opaque = A material that does not allow light to pass through. Diffuse reflection = Reflection off a rough surface.</p> Signup and view all the answers

Which one of the following is an example of a primary additive color?

<p>Red (B)</p> Signup and view all the answers

A non-luminous object produces its own light.

<p>False (B)</p> Signup and view all the answers

The angle between the incident ray and the normal is called the __________.

<p>angle of incidence</p> Signup and view all the answers

What is the correct order of the parts of the electromagnetic spectrum starting with the least energetic?

<p>Radio, Microwave, Infrared, Visible Light, UV Light, X-ray, Gamma Rays (B)</p> Signup and view all the answers

Ultraviolet light is primarily used for medical imaging.

<p>False (B)</p> Signup and view all the answers

List the seven colors identified in the visible spectrum of white light.

<p>Red, Orange, Yellow, Green, Blue, Indigo, Violet</p> Signup and view all the answers

When light passes from a faster medium to a slower medium, it bends ___.

<p>towards the normal</p> Signup and view all the answers

Match each electromagnetic wave with its primary usage:

<p>X-rays = Medical imaging Ultraviolet light = Vitamin D Radio waves = Telecommunication Microwaves = Radar Gamma rays = Cancer treatment Visible light = Theatre concert effects</p> Signup and view all the answers

What are the four characteristics of an image formed by a convex mirror?

<p>Size, Attitude, Location, Type (B)</p> Signup and view all the answers

What happens to an image in a concave mirror when the object is placed beyond the focal point?

<p>The image is inverted.</p> Signup and view all the answers

Convex mirrors provide a small field of view, making them ideal for sharp turns in parking garages.

<p>False (B)</p> Signup and view all the answers

Flashcards

Normal (in optics)

A line drawn perpendicular to the surface at the point where the incident ray strikes the surface.

Plane mirror

The smooth, flat surface that reflects light regularly.

Incandescence

Light emitted from a material being heated.

Angle of Incidence

The angle between the incident ray and the normal.

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Angle of Reflection

The angle between the reflected ray and the normal.

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Focal Length

The distance from the mirror to the focal point.

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Incident Ray

A light ray that travels towards the mirror.

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Diffuse Reflection

Type of reflection off an irregular surface which causes scattered and diffused reflection.

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Electromagnetic Spectrum

The arrangement of electromagnetic waves in order of increasing energy, starting with radio waves and ending with gamma rays.

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Microwave

A type of electromagnetic radiation used for communication, radar, and heating food.

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Radio Waves

A type of electromagnetic radiation that transmits information. Used in radio broadcasts, television, and cell phones.

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Infrared

A type of electromagnetic radiation that makes things warm. Used in heating and night vision.

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Visible Light

A type of electromagnetic radiation that is visible to the human eye. It consists of all the colors of the rainbow.

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Ultraviolet (UV) Light

A type of electromagnetic radiation that can cause sunburns and skin cancer. Used in some medical treatments.

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X-rays

A type of electromagnetic radiation that can penetrate tissues. Used in medical imaging and cancer treatment.

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Gamma Rays

The most energetic type of electromagnetic radiation. Used in medicine and industry.

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Refraction

The bending of light as it passes from one medium to another, caused by the change in the speed of light.

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Primary colours of light

The three primary colours of light are red, green, and blue. They are called primary colours because you cannot create them by mixing other colours, but you can mix them together to create all other colours.

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Secondary colours of light

Cyan, yellow, and magenta are the secondary colours of light. They are created by mixing two primary colours together.

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Mixing primary light colours

When red, green, and blue light overlap, they create white light. This is why you can see white in most light sources.

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Complementary colour to red

A complementary colour is a colour that, when combined with another colour, produces white light. The complementary colour to red is cyan.

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Study Notes

Optics Test Review

  • Reflection:
    • The angle of incidence equals the angle of reflection
    • The incident ray, reflected ray, and normal are on the same plane
  • Electromagnetic Spectrum (least to most energetic):
    • Radio waves
    • Microwaves
    • Infrared
    • Visible light
    • Ultraviolet
    • X-rays
    • Gamma rays
  • Electromagnetic Waves and Their Uses:
    • X-rays: Medical imaging
    • Ultraviolet light: Vitamin D
    • Radio waves: Telecommunication, TV remote control
    • Infrared light: Radar, theatre/concert effects
    • Microwaves: TV remote control, radar
    • Gamma rays: Cancer treatment
    • Visible light: Medical imaging, theatre/concert effects
  • Primary and Secondary Colors:
    • Primary colors: Red, green, blue
    • Secondary colors: Cyan, yellow, magenta
    • Combining primary colors produces white light
    • Combining secondary colors produces white light
  • Visible Spectrum Colors:
    • Red, orange, yellow, green, blue, indigo, violet
  • Reflection Types:
    • Specular reflection: Smooth surfaces, clear reflections (e.g., mirror)
    • Diffuse reflection: Irregular surfaces, scattered reflections (e.g., a wall)
  • Luminous and Non-luminous Objects:
    • Luminous objects produce their own light (e.g., sun, lightbulb)
    • Non-luminous objects reflect light (e.g., moon, table)
  • Types of Mirrors:
    • Plane mirror: Flat surface, creates upright, virtual images
    • Convex mirror: Bulging outward, creates smaller, virtual images, wide field of view
    • Concave mirror: Curves inward, image depends on object position (upright or inverted)

Laws of Reflection and Refraction

  • Refraction:
    • Light bends when traveling from one medium to another
    • When light moves to a slower medium it bends toward the normal.
  • Total Internal Reflection:
    • Occurs when light traveling from a slower to faster medium, bends past the critical angle, and is reflected back into the slower medium.
  • Concave Mirrors:
    • If the object is between the focal point and mirror, the image is upright and magnified, located behind the mirror (virtual).
    • If the object is beyond the focal point, the image is inverted, real, and smaller, located in front of the mirror.
  • Convex Mirrors:
    • The image is always upright and smaller, and virtual. The location is behind the mirror.
  • Color Mixing Summary:
    • Red, green and blue light create white light (or when superimposed).
    • Red light can not create a green color appears black.

Additional Questions

  • Complementary Colors:
    • Red's complementary color is cyan
  • Color Filters:
    • A green filter followed by a yellow filter, would result in a yellow color (filtering white light)
  • Ray Diagrams: Students are required to draw and label ray diagrams depicting how light reflects off mirrors and lenses. Analyze these diagrams to determine image characteristics.

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