Definition

Referring to lenses that are designed so that when one lens is in focus, other lenses will also be in focus at the same distance.

Example

The microscope is equipped with parfocal lenses, allowing for easy switching between magnifications without losing focus.

Conversation

Have you ever used a parfocal microscope before?

Yeah, I tried one at the lab last week, and it was great!

I heard they make switching between lenses so much easier.

Absolutely! It saves a lot of time since you don't have to refocus all the time.

Synonyms & Antonyms

Root Explanation

Parfocal → It is formed from "par" (from the Greek "para", meaning alongside or near) and "focal" (from Latin "focus", meaning hearth or center). The word "parfocal" describes lenses that maintain focus when changing from one magnification to another, hence being near the focal point.

Memory Tip

Think of lenses that stay 'near' ('para') the 'center' ('focus') of clarity when you change magnifications.

Visually Confused Words