Your Name _____________________________________________Period ______ Date __________
Forensic Science Word Study
Chapter 4 – Microscopy
Directions: Study the following words by reading and rereading them each evening so you will be
prepared for the word study test each week. You may use one index card to write as many words
and definitions on as possible to use for the test. The card must written in ink, be in your
handwriting, and have your name, your class period, and the chapter recorded in the top, right
corner with no obvious erasures or mark outs. ALL WORDS MUST BE NUMBERED. If all the
criteria are met, you may use your index card during the test. It will then be stapled to your test.
1.)
2.)
3.)
4.)
5.)
6.)
7.)
8.)
9.)
10.)
11.)
12.)
13.)
14.)
15.)
Simple magnification system – a single lens used to form an enlarged image and includes
pocket magnifiers and hand lens
Compound magnification system – two lens where magnification occurs in two stages and
the total magnification is the product of the first lens and the second lens
Virtual image – a reflected optical image which is an enlarged image produced by the first
lens on a microscope
Real image – formed when light rays originating from a point on one side of a lens (i.e.
the object) are refracted by the lens so that they focus (come together) to a point on
the other side of the lens at the image location. This happens when the object is father
away from the (converging) lens than the focal length.
Lens – in microscopy, a translucent material that bends light in a known and predictable
manner
Focal length – the size and position of an image produced by a lens that can be determined
through geometry using the distance between two points of focus on either side of the lens
Resolution – the smallest distance between two points on a specimen that can still be
distinguished as two separate entities
Compound microscope – an optical instrument for forming magnified images of small
objects, consisting of an objective lens with a very short focal length and an eyepiece with a
longer focal length, both lenses mounted in the same tube
Empty magnification – when a magnification exceeds the limits of resolution or in other
words, so highly magnified that is becomes useless because the image is no longer clear
Eyepiece or ocular lens – the lens or combination of lenses in an optical instrument nearest
the eye of the observer
Monocular – having a single eyepiece
Binocular – an instrument having two eyepieces, one for each eye
Field of view – the area that is visible through an optical instrument
Objective lens – the lens nearest to the object being examined that produces the real
image which can be shown on a screen
Resolution – the smallest distance between two points on a specimen that can still be
distinguished as two separate entities.