This technique is well-worth mastering for home cooks, as it's an easy way to cope successfully with thick steak and chop-style cuts of beef, pork and other meats. Step 1 Take the sirloin filets out of the refrigerator 45 to 120 minutes before you plan to cook them; chilled beef doesn't cook evenly.
The refractive index of current eyeglass lens materials ranges from 1.498 (CR-39 plastic) to 1.74 (a specific variety of high-index plastic). So for the same prescription power and lens design, a lens made of CR-39 plastic will be the thickest lens available, and a 1.74 high-index plastic lens will be the thinnest.
Eyepieces (ocular lenses): Two removable. lenses that you look through to observe the. specimen or object on the slide. The magnifying power of the ocular. lenses on your microscope is 10X. The circle you can see through the eyepiece. is called the field of view . Note: one of the oculars may have a pointer. used to identify a specific area on the slide.