ZOO101 Midterm PPT Handouts

Types of microscopes

Depending on the number of lenses, there are two i. e 1. Simple light microscopes: use a single lens to magnify an object and cannot reach high magnification.

2. Compound light microscope (it has a higher magnification compared to the simple microscope because it uses at least two sets of lenses, an objective lens, and an eyepiece). The lenses are aligned in that, they can be able to bend light for efficient magnification of the image. The simplest microscope of all is a magnifying glass made from a single convex lens, which typically magnifies by about 5–10 times.

Microscopes used in homes, schools, and professional laboratories are actually

compound

microscopes and use at least two lenses to produce a magnified image. Most compound microscopes can magnify by 10, 20, 40, or 100 times

MAGNIFICATION · • Degree of enlargement. · • No of times the length, breadth · or diameter, of an object is · multiplied. · • depends upon 3 factors

1.

Optical tube length

2.

Focal length of objective

3.

Magnifying power of eye piece

Total magnification=magnification of the eyepiece x magnification of the objective. =10x40 = 400 =10x100 = 1000