Flashcards in Single Slit Diffraction Deck (33):

1

## Change in direction of propagation of light NOT due to reflection of refraction

### Diffraction

2

## The deviation from rectilinear propagation that occurs when light advances beyond an obstruction

### Phenomenon of diffraction

3

## Can we use snellls law to predict diffraction

### No

4

## Diffraction at the edge of an aperture does what to images

### Blurs images of objects

5

## What proved light is a wave?

### Diffraction

6

## What is Huygens principle

### All points on a wavefront can be considered as point sources for the production of spherical secondary wavelets, and at any later time the new wavefront position in the envelope (or surface of tangency) to these secondary wavefronts

7

## What is fresenels expansion on Huygens principle

### For light in the same bundle (waves from the same point source) the secondary wavelets undergo mutual interference. Interfere constructively and destructively

8

## What is the ripple effect in the diffraction pattern due to?

### The constructive and destructive interference of the secondary wavelets

9

## When a single slit is vertical, the waves are diffracted _______

### Horizontally

10

## When a single slit is horizontal, the waves are diffracted ______

### Vertically

11

## When a vertical slit is placed against a horizontal slit of the same width, the combo forms ________

### A square aperture

12

## When a circular aperture is illuminated by a monochromatic plane wave, the waves are diffracted_________

### Equally in all directions

13

## Wavelength of spruce equal to or larger than width of the slit (lambda > a), forms _________

### Diffraction pattern

14

## For diffraction to occur, what is the relationship of d and a?

### D should be larger than a

15

## Path difference in single slit diffraction

### asin(theta)=m(lambda)

16

## What are the two types of diffraction?

###
-fresnel (near field) diffraction

-Fraunhofer (far-field) diffraction

17

## Fresnel (near field) diffraction

###
The source of light and the screen are at finite distance from the diffraction aperture

Can be converging or diverging, but not collimated

18

## Fraunhofer (far field) diffraction

###
The source of light and the screen are at an infinite distance from the diffraction aperture

Can be collimated

19

## Which type of diffraction is easy to observe and calculate the intensity distribution

### Fraunhofer (far field) diffraction

20

## Bright in the center of a shadow, ex. Floaters in the eye

### Poisson spot

21

## Near field diffraction

### Fresnel diffraction

22

## Far field diffraction

### Fraunhofer diffraction

23

## Finite distance from slit to screen

### Fresnel diffraction

24

## Infinite distance from slit to screen

### Fraunhofer diffraction

25

## Converging or diverging wave

### Fresnel difffraction

26

## Plane waves

### Fraunhofer diffraction

27

## Difficult to observe and calculate

### Fresnel diffraction

28

## Easy to observe and calculate

### Fraunhofer diffraction

29

## Diffraction patterns vary with distance (slit to screen)

### Fresnel diffraction

30

## Insensitive to distance changes (maintains same angular relationship)

### Fraunhofer diffraction

31

## Which type of diffraction yields a poisson spot?

### Fresnel diffraction

32

## Combined effect of 2 slits and single slit interference

### With 2 slits, not only will you see diffraction patterns due to individual single slits, but also interference patterns due to the waves coming from different slits

33