Key Terms
What are objective lenses?
The lens in a refracting telescope or microscope .
Name the part that magnifies the specimen and is the part you look through.
Eyepiece.
Name a simple kind of magnifying glass.
Microscope.
Which instrument collects and focuses light from a distant object?
Refracting telescope.
What did scientists discover through microscopes?
Scientists discovered through microscopes that all living organisms consist of cells.
Are objective lenses convex or concave?
Convex
Name the part that supports the microscope.
Base
Usually magnifying glasses are used up to about ___ times the actual size for magnifications.
Ten.
Which telescope collects ray of light from a distant object?
Reflecting telescope.
True or False: Cells become smaller when they're cancerous.
False.
What is the objective mirror also known as?
Primary mirror.
Name the part that provides light to see the specimen.
Light source.
Up to ____ objects can be magnified by modern compound light microscopes.
2000
What allows binoculars to be made shorter than telescopes?
Prisms
Now scientists are studying the ___________ of cells using microscopes.
Genetic makeup.
What does an eyepiece lens do?
Enlarges an image in a telescope or microscope.
Name the part that holds the slide in place.
Stage clips.
Compound microscopes use more than one lens in the objective and in the eye-piece to enhance the image's _________.
Sharpness.
What two things act as light collectors in telescopes?
Convex lens and concave mirror.
In what century did telescopes discover a lot of scientific knowledge about the universe ?
17th.
What are Prisms?
Glass blocks serving as plane mirrors in binoculars.
Name the part that switches magnifications.
Revolving nosepiece.
Nevertheless, by using a single convex lens, Dutch scientist ____________ was able to see bacteria in 1676.
Anton Van Leeuwenhoek.
True or False:the greater the magnification, the farther the image is from the lens.
True
The microscope had a biggest impact on ...
a.farmers c.teachers
b.astronomers d.dancers
b.astronomers.