Two basic kinds of lenses are the concave lens and the convex lens.
microscope has two lenses to increase its magnification
A microscope and eyeglasses are two examples of scientific lenses.
convex and concave are two types of lenses that are used to correct defects in vision.
there are two types of optical fiber,the first type is single mode fibers.the second type is multimode fibers.
cause there are two eyes so two lenses in the sunglasses
concave and convex lenses are used in eye glassses
Linear and rotational
Analog and digital :)
Primary and secondary sources.
The two basic kinds of cells are prokaryotic (bacteria) and eukaryotic cells, a eukaryotic cell has a nucleus and organelles, but prokaryotic don't have a nucleus and have ribosomes instead of organelles.
Federal and state
There is no difference between adult contacts and regular contacts. There are two kinds of contact lenses; extended wear and disposable. There are also colored contact lenses.
Tyranasaurus Rex and Dinosaurus.
Ribonucleic acid and deoxyribonucleic acid.
The two basic kinds of fats are saturated fats and unsaturated fats.The reason for these names involves a little bit of chemistry but I will leave this here and hope that's all you wanted.Hope this helps!
There are two basics kinds of bit, snaffle and curb.
On eyeglasses? Two lenses = bifocals Three lenses = Trofocals