Microscopes: From Light to Electron

Overview:  The Microscope
The microscope is a valuable tool in biology and other sciences.  It allows investigators to study many objects that are too small to be seen with eyes alone.  While many observations can be done with simple and compound light microscopes, the smallest details are shown with electron microscopes.

Simple Light Microscopes
The simplest microscope is a magnifying glass that works by focusing light to magnify very small objects.  Scientists may have used them as early as the 15th century, although the  finest lenses were made by van Leeuwenhoek in the late 17th century. He was able to study  and draw organisms in pond water, a very familiar activity in science classes from elementary school on.

Compound Light Microscopes
The earliest compound light microscope had a lens on each end of a long tube.  They worked by using one lens as a magnifying glass, then magnifying that image with another lens.  Scientists tended to prefer single lenses for magnification, because the images from early compound light microscopes were distorted.  Modern compound light microscopes minimize some of the distortion by the way the lenses are arranged.

Magnification
The most common microscopes used in science classes are compound light microscopes.  One lens is near the eyepiece of the microscope, and the other lens is positioned near the specimen slide.  The light source is under the slide, so that light actually travels through the slide and specimen and then is focused through the lenses.  The increase in the specimen’s size is measured by magnification.  The power of the lenses is multiplied as they work together, so an ocular lens in the eyepiece that magnifies 10 times and an objective lens that magnifies  the size of the object 43 times will magnify the entire specimen 43 X 10, or 430 times its size.  At higher magnification than 2000 times, images become too distorted and fuzzy and lose resolution.

Preparing Specimens
Many specimens must be specially prepared for viewing under a microscope.  Tiny slices of matter must be thin and small enough to fit on the microscope slide.  A microtome is a tool that cuts very thin slices from specimen material.  In addition, specimens must often be stained in order to show up details.  Common stains color red or blue, and special dyes have been developed that do not kill or distort cell structures.  Specimens for the electron microscope must be embedded in plastic, cut even thinner, and coated with a very thin metallic layer.

Electron Microscopes
Electron microscopes produce a source with a wavelength smaller than visible light, so objects can be magnified much more than 2000 times their size.  However, specimens are prepared differently and are viewed in a vacuum.  The transmission electron microscope magnifies specimens more than 200,000 times their size, and a scanning electron microscope produces highly-detailed, three-dimensional images.  Electron microscopes have been developed that combine the best features  of the transmission electron microscope and the scanning electron microscope.

Interested in Science tutoring services? Learn more about how we are assisting thousands of students each academic year.

SchoolTutoring Academy is the premier educational services company for K-12 and college students. We offer tutoring programs for students in K-12, AP classes, and college. To learn more about how we help parents and students in Bangor, ME visit: Tutoring in Bangor, ME

 

640 thoughts on “Microscopes: From Light to Electron”

  1. Pingback: canada goose coats
  2. Pingback: oakley vault
  3. Pingback: ysl グロス
  4. Pingback: ysl クラッチ
  5. Pingback: ugg outlet
  6. Pingback: magasin jordan
  7. Pingback: sac celine solde
  8. Pingback: asic gel nimbus
  9. Pingback: gucci montre homme
  10. Pingback: prix du sac celine
  11. Pingback: parajumpers outlet
  12. Pingback: ugg boots outlet
  13. Pingback: womens nike shox
  14. Pingback: hermes birkin 1984
  15. Pingback: parajumpers alaska
  16. Pingback: asics 2170
  17. Pingback: asics tennis shoes
  18. Pingback: parajumpers kids
  19. Pingback: veste canada goose
  20. Pingback: parajumber
  21. Pingback: parajumpers uk
  22. Pingback: asics kayano 18
  23. Pingback: nike sweet classic
  24. Pingback: asics kayano 19
  25. Pingback: classic ugg onlnie
  26. Pingback: asics gel noosa
  27. Pingback: gt 2140 asics
  28. Pingback: asic nimbus women
  29. Pingback: parajumper norge
  30. Pingback: parajumper heren
  31. Pingback: asics gel lyte
  32. Pingback: chapeau hermes
  33. Pingback: womens air jordans
  34. Pingback: asic nimbus 13
  35. Pingback: parajumpers 2011
  36. Pingback: vetement hermes
  37. Pingback: formation hermes
  38. Pingback: parajumper cheap
  39. Pingback: asic
  40. Pingback: asics noosa
  41. Pingback: parajumpers kids
  42. Pingback: canada goose hat
  43. Pingback: michael kors butik
  44. Pingback: new balance wiki
  45. Pingback: asics sneakers
  46. Pingback: ugg america
  47. Pingback: para jumpers
  48. Pingback: asics noosa tri 8
  49. Pingback: wholesale Celine
  50. Pingback: goose down
  51. Pingback: moncler shop
  52. Pingback: uggs black friday
  53. Pingback: asics knee pads
  54. Pingback: jimmy choo heels
  55. Pingback: new nikes
  56. Pingback: asics gel lyte
  57. Pingback: nike air trainer
  58. Pingback: cheap ray bans
  59. Pingback: asics womens shoes
  60. Pingback: chanel tasche
  61. Pingback: Moncler mens coats
  62. Pingback: toms boxing day
  63. Pingback: ugg boots outlet
  64. Pingback: Pjs Parajumpers
  65. Pingback: parajumpers sale
  66. Pingback: celine
  67. Pingback: Cheap Moncler Coat
  68. Pingback: Uggブーツ3312
  69. Pingback: cheap uggs
  70. Pingback: nike cleats soccer
  71. Pingback: Cheap Mcm
  72. Pingback: nike baseball caps
  73. Pingback: Parajumpers Sale
  74. Pingback: nike air jordan
  75. Pingback: Parajumpers Sale
  76. Pingback: louis vuitton bags
  77. Pingback: uggs on sale
  78. Pingback: Coach Black Friday
  79. Pingback: cheap uggs
  80. Pingback: Coach Black Friday
  81. Pingback: Coach Black Friday
  82. Pingback: Coach Black Friday
  83. Pingback: cheap uggs
  84. Pingback: Coach Black Friday
  85. Pingback: red mulberry mcrae
  86. Pingback: Coach Black Friday
  87. Pingback: new balance 890 v1
  88. Pingback: louis vuitton bags
  89. Pingback: Coach Black Friday
  90. Pingback: parajumpers coat
  91. Pingback: parajumpers desert
  92. Pingback: parajumper jackets
  93. Pingback: asics kinetic 3
  94. Pingback: Chanel Pas Cher
  95. Pingback: louis vuitton bags
  96. Pingback: fake parajumpers
  97. Pingback: parajumper norge
  98. Pingback: online new balance
  99. Pingback: Louis Vuitton Bags
  100. Pingback: michael kors italy
  101. Pingback: louis vuitton bags
  102. Pingback: gobi parajumper
  103. Pingback: www.kcfglaw.com
  104. Pingback: gucci outlet
  105. Pingback: gucci outlet
  106. Pingback: canada goose down
  107. Pingback: louis vuitton bag
  108. Pingback: asics kill bill
  109. Pingback: www.roughhouse.org
  110. Pingback: nike free danmark
  111. Pingback: new balance mx623
  112. Pingback: canada goose kids
  113. Pingback: buy wow gold
  114. Pingback: mcm bags choice
  115. Pingback: Cheap UGGs
  116. Pingback: cheap uggs
  117. Pingback: michael kors nylon
  118. Pingback: parajumpers xxxl
  119. Pingback: North Face Outlet
  120. Pingback: North Face Outlet
  121. Pingback: parajumper outlet
  122. Pingback: fairfield176.com
  123. Pingback: ugg 通販
  124. Pingback: kate spade sale uk
  125. Pingback: coach outlet
  126. Pingback: gucci outlet
  127. Pingback: www.watchesexm.com
  128. Pingback: UPETSbdX
  129. Pingback: Mcm Totes
  130. Pingback: cheap uggs
  131. Pingback: uggs australia
  132. Pingback: ugg boots cheap
  133. Pingback: mens ugg boots
  134. Pingback: uggs for men
  135. Pingback: uggs for kids
  136. Pingback: ugg boots sale
  137. Pingback: ugg sale boots
  138. Pingback: ugg slippers men
  139. Pingback: ugg sale clearance
  140. Pingback: North Face Outlet
  141. Pingback: wow gold
  142. Pingback: ugg cyber monday
  143. Pingback: Coach Outlet
  144. Pingback: Gucci Outlet
  145. Pingback: North Face Outlet
  146. Pingback: Gucci Outlet
  147. Pingback: Gucci Outlet
  148. Pingback: Gucci Outlet
  149. Pingback: Gucci Outlet
  150. Pingback: Cheap NFL Jerseys
  151. Pingback: ugg moccasins
  152. Pingback: ugg bailey button
  153. Pingback: uggs uk
  154. Pingback: ugg sale
  155. Pingback: gucci outlet
  156. Pingback: ugg
  157. Pingback: ugg boots outlet
  158. Pingback: Louis Vuitton Bags
  159. Pingback: uggs for men
  160. Pingback: uggs outlet online
  161. Pingback: kors outlet online
  162. Pingback: Coach Outlet
  163. Pingback: ugg outlet
  164. Pingback: baby uggs
  165. Pingback: Cheap NFL Jerseys
  166. Pingback: North Face Outlet
  167. Pingback: ugg outlet store
  168. Pingback: Replica Bags

Comments are closed.