Light Reflection and Refraction Flashcards Preview

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Flashcards in Light Reflection and Refraction Deck (25)
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1

Speed of Light

3 x 10 (to the eighth power) m/sec in a vacuum

2

What are the three colors of light?

Red, Green, Blue

3

Light is _____________; Pigment is ______________.

Additive; Subtractive

4

Absorbing all colors but the color you want to see

Subtractive (Pigments)

5

Reflecting the colors you want to see

Additive (Light)

6

Fermat's Principle of Least Time

Of all possible paths light can take to get from point A to point B, light will travel the path that requires the least time.

7

T/F: Fermat's Principle applies to both Reflection and Refraction.

True

8

When light enters a new medium at an angle and it bends it is called_____________

Refraction

9

When light enters a new medium, the entire wave does not ____________________________.

change at the same time.

10

Light slows down as it enters more ___________ media and speeds up in a less____________ media.

Dense; Dense

11

In refraction, the degree to which light bends depends on the __________________________ between the two ______________.

Difference; Media

12

Snell's Law shows that the ratio of the _____________, _________________ and ________________ are equal when light refracts from one media into another.

Angles of Refraction;
Refraction Indices
Speed of waves

13

Snell's Law explains how light will bend _____________ the normal if it enters a more dense medium, and light will bend _____________ the normal if it enters a less dense medium.

Towards the normal in a more dense medium
Away from the normal in a less dense medium

14

Light waves enter a medium and different parts refract at different angles

Dispersion

15

The angle in a more dense medium that yields an angle of refraction of 90 degrees

Critical Angle; the maximum incident angle that gives refraction

16

In reflection, the angle of _____________ is equal to the angle of ______________.

Incidence; Reflection

17

A medium in which you can see yourself

Specular

18

An image that does not really exist

Virtual Image

19

Reflected rays that we "imagine" to be where they came from

Virtual Image

20

Point where the light seems to come from

Focal Point

21

A mirror that is flat and smooth, an almost perfect reflector of light

Plane Mirror

22

Two types of reflection

Specular
Diffuse

23

An enlarged image in a narrow field of view would appear in what type of mirror?

Concave (magnifying mirror)

24

A reduced image in a wider field of view would appear in what type of mirror?

Convex (surveillance/safety mirror)

25

Law of Refraction

Light bends towards the normal when entering a medium in which light travels more slowly (denser medium). Light bends away from the normal when entering a medium in which light travels faster (less dense medium.)