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Physics > Chapter 12 - Light > Flashcards

Chapter 12 - Light Flashcards

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1
Q

The angle of incidence is always between ______ and _______

A

The incidence ray and the normal

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2
Q

FIVE characteristics of image form on a plane mirror

A 
Image same size as the object 
Virtually converted
Upright
Virtual
Image distance from mirror same as the object distance from mirror
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3
Q

Use of mirror

A

Vision Testing

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4
Q

When refraction of light happens?

A

When light enter a medium from another medium with different density

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5
Q

When light enters a optically denser medium from a less dense medium, it will bend _______ the normal, WHY?

A

Towards the normal

This is because the speed of the light slow down when it enters a denser medium

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6
Q

When light enters a optically less dense medium from a denser medium, it will bend _____ away from the normal, WHY?

A

Away the normal

This is because the speed of the light increases

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7
Q

When angle of incidence is 0 degree, what is the angle of refraction?

A

0 degree, there is no refraction

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8
Q

In a situation of the light enters from air to glass to air again, the both angles of light in air must be PARALLEL , T/F

A

True

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9
Q

Laws of reflection (2)

A

The incident ray, reflected ray and the normal at the point of incidence all lie in the same plane

The angle of incidence is equal to the angle of reflection

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10
Q

Refractive Index =

A

sin (

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11
Q

Define Refractive Index

A

The ratio of the speed of light in vacuum to the speed of light in the medium

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12
Q

The greater the refractive index value, the ______ more the bending of light as it enters the medium from air

A

More

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13
Q

Laws of Refraction

A

The Incident Ray, Normal and the refracted Ray all lie in the same plane

For two given media, the ratio of the size of the angle of incidence, i, to the size of the angle of refraction, r, is a constant

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14
Q

Refractive Index (denser to less dense) =

A

sin (

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15
Q

Refractive Index (light from air to breaker) =

A

Real Depth / Apparent Depth

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16
Q

Define Critical Angle

A

Angle of incidence in an optically denser medium for which the angle of refraction in the optically less dense medium is 90 degree.

17
Q

When do total internal reflection occurs?

A

When light enters a OPTICALLY less dense medium from a OPTICALLY denser and the angle of incidence is increased beyond the critical angle

18
Q

Critical Angle (Angle of Incidence)

A

Refractive Index = Sin 90 (

19
Q

Use of internal reflection

A

Pentaprism in camera which allow the photographer to see the actual picture

20
Q

Another use of internal reflection - Optical Fibre, how does it work and what are the advantages

A

The optical fibres is made of pure glasses. The core is made of pure glass with high refractive index and the cladding is made of pure glass with low refractive index. Hence, the light inside a core are totally internally reflected.

Adv. Optical Fibre replaces copper wires in television system as it is THINNER, CHEAPER, CARRY MORE SIGNAL.

21
Q

What a lens diagram consist of?

A

Lens, Centre of lens

Principle axis, horizontal line through the middle of lens

Focal Point

Focal Length, Distance between the centre of lens and the focal point

22
Q

Three Special Ray for converging lens

A

An incident ray through the optical centre C passes without bending

An incident ray parallel to the principle axis is refracted to pass though F

An incident Ray pass through the Focal point F is refracted parallel to the principal axis

23
Q

Details of Ray diagram when object is behind 2F

A 
Image is 
between F and 2F 
Inverted 
Real
Diminished
Uses: Camera
24
Q

Details of Ray Diagram when Object is at 2F

A 
Image at 2F 
Inverted 
Real
Same Size
Uses: photocopier
25
Q

Details of Ray Diagram when Object between 2F and F

A 
Image is behind 2F 
Inverted 
Real 
Magnified
Use: Projector
26
Q

Details of Ray Diagram PARALLEL Ray from a DISTANCE object which pass through F

A 
Image at F
Inverted
Real 
Diminished
Uses: Telescope
27
Q

Details of Ray Diagram when Object at F

A 
Image, same side as the object, at infinity
Upright
Virtual 
Magnified
Uses: produce a parallel beam of light
28
Q

Details of Ray Diagram when Object is in front of F

A 
Image: same side as the object
Upright
Virtual 
Magnified
Use: Magnified Glass
29
Q

Details of PARALLELS Rays in Diverging lens

A

Middle Ray will pass through centre of Lens straight

Side Rays will diverge to the line that is directly connected to the focal point.

Physics (21 decks)

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