{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# lecture35 - Diffraction(38.1 38.4 Interference effects for...

This preview shows pages 1–3. Sign up to view the full content.

Interference effects for continuous sources: i) Light bends around corners. ii) “Shadows” fill in iii) “Parallel” beams always spread iv) Resolution of microscopes and telescopes limited Diffraction Diffraction (38.1 – 38.4) Practice: Chapter 38, problems 3, 7, 13, 25, 28 Fraunhofer Diffraction : (easy math) Source, screen “ at 4 eg. Laser & narrow slit. Fresnel Diffraction : (complicated math) Source distance, object size, screen distance all comparable. eg. Source Steel Ball Screen Shadow Poisson Spot

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Huygens’s Huygens’s Principle Principle (Christiaan Huygens, (Christiaan Huygens, ~ ~ 1678) 1678) e.g. , parallel beam of light: “Plane wave” wavefronts: flat planes for a parallel beam. Wave propagation can be treated as if each point on a wavefront is a source of semicircular“wavelets” spreading out in forward directions. These wavelets overlap and interfere to form the wave at later times. Flat wavefront (parallel rays) gives a new flat wavefront (EXCEPT near the edges).
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 7

lecture35 - Diffraction(38.1 38.4 Interference effects for...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online