Chemistry Department;
Faculty of Science;
Cairo University;
Giza;
Egypt;
Physics Department;
Faculty of Science;
Ain Shams University;
Cairo;
Egypt;
Physics Department;
Faculty of Science;
Benha University;
Benha;
Egypt;
Physics Department;
Faculty of Science;
Cairo University;
Giza;
Egypt;
Thermotropic; Liquid; Crystal; Interference; Birefringence; Speckle; Photography;