refracting telescope refraction refraction anisotropy refraction axis refraction of light refractive refractive exponent refractive index refractivity refractometer refractometry refractor refractories refractory refractory alloy refractory brick refractory cement refractory clay refractory concrete refractory-faced |
refracting telescope рефракторен телескоп Търсената дума е намерена |