P14(Light) Flashcards

1
Q

What is the normal

A

The line perpendicular to the mirror

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2
Q

What is the angle of incidence

A

The angle between the incident ray and the normal

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3
Q

What is the angle of reflection

A

The angle between the reflected ray and the normal

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4
Q

What is the law of reflection

A

The angle of incidence = the angle of reflection

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5
Q

What is a virtual image

A

An image that is formed when the light rays from an object do not meet but appear to meet behind the lens

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6
Q

What is specular reflection

A

-Reflection from a smooth surface in a single direction
-the angle of reflection is equal to the angle of incidence

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7
Q

What is diffuse reflection

A

Reflection from a rough surface causes scattering

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8
Q

What is refraction

A

The change in direction of waves when they travel across a boundary from one medium to another

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9
Q

When a light ray refracts from air into glass …

A

The angle of refraction is less than the angle of incidence

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10
Q

When a light ray refracts from glass into air

A

The angle of refraction is more the angle of incidence

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11
Q

The wavelength of light increases….

A

From violent to red across the visible spectrum

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12
Q

The colour of a surface depends on …

A

The pigments of the surface materials and the wavelengths of light the pigments absorb

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13
Q

What is a translucent object

A

-An object that lets light pass through it
-but scatters the light inside it

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14
Q

What is a transparent object

A

-An object that lets all the light that enters it through it
-does not scatter the light inside the object

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15
Q

What is a convex lens

A

A lens that focuses parallel rays to a point called the principal focus

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16
Q

What is the principal focus

A

The point where parallel rays are focused to

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17
Q

What are convex lens used for

A

-magnifying glass
-camera

18
Q

What is a concave lens

A

A lens that makes parallel rays spread out as if they had come from the principal focus

19
Q

What is a concave lens used for

A

To correct short sight

20
Q

What is the focal length

A

The distance from the centre of the lens to the principal focus

21
Q

A real image is formed…

A

if the object is placed at a distance greater than the focal length from the lens

22
Q

A virtual image is formed…

A

If the object is placed closer to the lens than the focal length

23
Q

What’s the formula for magnification

24
Q

When an object is placed between a convex lens and its principal focus …

A

The image formed is virtual

25
What is the lens diagram for a convex lens for a real image
26
How would you describe a real image on a convex lens diagram
Real: the light rays meet each other after refraction Magnified: the image is larger than the object Inverted: the image is formed on the opposite side of the principal axis
27
What is the lens diagram for a convex lens for a virtual image
28
How would you describe a virtual image on a convex lens diagram
Virtual: the light rays appear to meet when produced backwards Magnified: the image is larger than the object Upright: the image is formed on the same side of the principal axis
29
Concave lens only produce …
Virtual images
30
What is the lens diagram for a concave lens
31
How would you describe an image on a concave lens diagram
Virtual: the light rays appear to meet when produced backwards Diminished: the image is smaller than the object Upright: the image is formed on the same side of the principal axis
32
What is a real image
An image that is formed when the light rays from an object converge and meet each other
33
Real images are always ….
inverted
34
Virtual images are always ….
upright
35
What is the visible spectrum
36
Colour filters work by …
-absorbing certain wavelengths and transmitting other wavelengths -For example, when white light passes through a red filter: Red light is transmitted All the other colours are absorbed
37
An object will appear white if …
All wavelengths are reflected equally
38
An object will appear black if …
All wavelengths are absorbed
39
An object will appear transparent if …
All the light is transmitted, and only a small amount is reflected or absorbed
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