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Science 8 > Topic 1,2 & 3-Light & Optics > Flashcards

Topic 1,2 & 3-Light & Optics Flashcards

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1
Q

What are the four properties of light?

A

Light travels in straight lines
Light can be reflected
Light can bend
Light is a form of energy

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2
Q

What is an optical device?

A

Any technology that uses light

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3
Q

What are translucent materials?

A

Allows some light to pass through but not all

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4
Q

What are transparent materials?

A

Light travels straight through the material

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5
Q

What are opaque materials?

A

Do not allow any light to pass through them

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6
Q

What is regular reflection?

A

Occurs when light rays hit a smooth surface. The incoming rays travel parallel to each other. When these rays strike a smooth surface they all bounce off in the same direction and the rays are reflected at the same angle

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7
Q

What is diffuse reflection?

A

Occurs when light rays hit a rough or uneven surface. When the light rays hit the surface they reflect but due to the rough surface each of the rays is reflected at a different angle. The rays to not remain parallel

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8
Q

What are incident rays?

A

The incoming rays

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9
Q

What are plane mirrors?

A

Flat mirrors that provide the clearest reflections

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10
Q

What is the law of reflection?

A

When a ray of light hits a plane mirror at an angle, it bounces off the mirror surface at exactly the same angle

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11
Q

What is a normal in the law of reflection?

A

A line perpendicular to the mirror at the point of reflection

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12
Q

What is the angle of incidence in the law of reflection?

A

The angle between the incident ray and the normal

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13
Q

What is the angle of reflection in the law of reflection?

A

The angle between the reflected ray and the normal

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14
Q

What is a concave mirror?

A

Reflecting surface that is curved inward

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15
Q

What is a focal point?

A

Concave mirrors reflect parallel ray of light back through the focal point

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16
Q

What happens to an image in a concave mirror if the object is farther away from the focal point?

A

The image is upside down and small

17
Q

What happens to an image in a concave mirror if the object is in between the focal point and the mirror?

A

The image appears upright and enlarged

18
Q

What is a convex mirror?

A

Reflecting surface that curves outward

19
Q

What happens to the parallel rays of light that reflect off a concave mirror?

A

They gather inwards toward the focal point

20
Q

What happens to the parallel rays of light that reflect off a convex mirror?

A

They reflect outwards away from the focal point

21
Q

What is refraction?

A

When light travels from one substance to another it bends or refracts

22
Q

What is a concave lens?

A

Piece of transparent material that is thinner in the middle than at the edges

23
Q

What happens to parallel rays of light that pass through a concave lens?

A

The rays of light diverge and spread out

24
Q

What is a convex lens?

A

A piece of transparent material that is thicker in the middle than the edges

25
Q

What happens to parallel rays of light when they pass through a convex lens?

A

It brings the light rays together much like a concave mirror

26
Q

What is the wave model of light?

A

Models used to explain the characteristics and behaviour of light energy. It describes light as energy in the form of waves. The different colours of light have different wavelengths

27
Q

What is amplitude?

A

Height of the wave from its middle test position to its highest point

28
Q

What is the crest?

A

Highest point of a wave

29
Q

What is the wavelength?

A

The distance from the crest of one wave to the next

30
Q

What is the frequency?

A

The number of times the medium vibrates in a given amount of time

31
Q

What colour has the highest wavelength but the lowest frequency?

A

Red

32
Q

What colour has the lowest wavelength but the highest frequency?

A

Violet

33
Q

What is electromagnetic radiation?

A

All forms of radiant energy (visible light, infrared ration, ultraviolet radiation, radio waves, X rays, etc.)

34
Q

What is the electromagnetic spectrum?

A

Refers to the whole range of wavelengths of visible and invisible electromagnetic radiation

Science 8 (16 decks)

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