Bifocals
The term "bifocal" refers to eyeglasses with two distinct optical powers, typically used to correct both nearsightedness and farsightedness in a single lens.
The prefix mal means bad or evil.
Omnipotent
The word "nomadic" doesn't contain a prefix. It's from the Greek word nomas, nomados meaning "pastoral." It does contain a suffix, "-ic" from the Latin -icus meaning "having to do with; characterized by."The word "nomadic" can be used with a prefix, as in the word "seminomadic."
Glasses are a plural form for glass (a drinking glass, or a lens). To indicate the plural of glasses (eyewear, a pair of eyeglasses), you would have to use the description "pairs of glasses."
The adjective stubby is from the root word "stub" (a noun) with a doubled B before the suffix -y (like, having the form of). There is no prefix.
separated
One word with the prefix "andro" is "androgynous," which means having characteristics of both male and female.
Maximise has no prefix, since imise is not a word, although max is a root of maximise, meaning to enlarge, or having to do with increase in size.
No the word forefather is not a prefix, but there is a prefix in the word. The prefix in the word forefather is Fore, meaning before.
A hendecagon is an eleven sided shape. Is that what you meant?Hendeca is the Greek word for eleven.
poly