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CC-2224 Physics Paper 2 Topics > P14(Light) > Flashcards

P14(Light) Flashcards

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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

A
24
Q

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

A

The image formed is virtual

25
Q

What is the lens diagram for a convex lens for a real image

A
26
Q

How would you describe a real image on a convex lens diagram

A

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
Q

What is the lens diagram for a convex lens for a virtual image

A
28
Q

How would you describe a virtual image on a convex lens diagram

A

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
Q

Concave lens only produce …

A

Virtual images

30
Q

What is the lens diagram for a concave lens

A
31
Q

How would you describe an image on a concave lens diagram

A

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
Q

What is a real image

A

An image that is formed when the light rays from an object converge and meet each other

33
Q

Real images are always ….

A

inverted

34
Q

Virtual images are always ….

A

upright

35
Q

What is the visible spectrum

A
36
Q

Colour filters work by …

A

-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
Q

An object will appear white if …

A

All wavelengths are reflected equally

38
Q

An object will appear black if …

A

All wavelengths are absorbed

39
Q

An object will appear transparent if …

A

All the light is transmitted, and only a small amount is reflected or absorbed

40
Q
A
41
Q
A
42
Q
A

CC-2224 Physics Paper 2 Topics (10 decks)

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