[Home ] [Archive]   [ فارسی ]  
:: Volume 21 - ::
ICOP & ICPET 2015, 21 - : 1369-1372 Back to browse issues page
Determination of the focal length by central fringe displacement in Fresnel diffraction from phase plate
Mohadese Abbasi Miss * 1, Masoomeh Dashtdar Dr1
1- Shahid Beheshti University
Abstract:   (1673 Views)
When a transparent plate is illuminated perpendicular to its surface by a monochromatic convergent beam of light, the Fresnel fringes, caused by abrupt change in refractive index at the plate boundary, are formed periodical and symmetrical around the optical axis on the observation plane. When the plate is rotating around the direction normal to optical axis and plate boundary, the fringes are moved and formed around the ray that is perpendicular to the plate surface. It is shown theoretically and experimentally that the focal length of lenses can be determined by measurement of the displacement of the central Fresnel fringe.
Keywords: Focal length, Fresnel diffraction, Phase step
Full-Text [PDF 337 kb]   (556 Downloads)    
Type of Study: Research | Subject: Special
Send email to the article author

Add your comments about this article
Your username or Email:

CAPTCHA code


XML   Persian Abstract   Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Abbasi M, Dashtdar M. Determination of the focal length by central fringe displacement in Fresnel diffraction from phase plate. ICOP & ICPET. 2015; 21 :1369-1372
URL: http://opsi.ir/article-1-866-en.html


Volume 21 - Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
Persian site map - English site map - Created in 0.05 seconds with 30 queries by YEKTAWEB 3781