توريهاي منطقه اي فرنل و روزنه هاي دايروي با پايه نگهدارنده (Circular openings and Fresnel’s Zone Plates with holder)

Optic Experiments Equipment

To investigate generation of convergent light beams with the assistance of Fresnel’s zone theory. The diaphragm has a system of 20 light a dark rings, limit circles between the rings have a diameter d_n=۱.۵۹۱n½ (n=1 , 2 , …); focal distance for He-Ne light ( λ = ۶۳۲.۸ nm ) , f = 1 , 1.5 , 2 m – size = 50 × ۵۰ mm . The plates are odd and even. And there is a diaphragm with f = 14 mm approx. only for observation and education

Diameter of holder : 12 Cm

Stand rod : 13 Cm × ۸ mm