In this exercise students will examine three optical instruments, a simple magnifier,
a simple, refracting telescope, and a compound microscope.
After studying the reference material, go to blackboard
and complete Extra Credit 10.
You must answer the following questions.
The magnifying power of a small Keplerian telescope is 25
and the separation between its objective and eye piece is 52 cm in normal
The focal lengths of its objective and eye piece are
--- and ---, respectively.
The focal lengths of the eye piece and objective
of a telescope are respectively 100 cm and 2 cm.
The moon subtends an
angle of 0.5o at the eye.
If it is looked
at through the telescope, the angle subtended by the moon's
image will be ---.
The length of a
Galilean telescope is given in terms of the focal lengths
of objective and eyepiece by ---.
When the object distance from a converging lens
is 5.0 cm, a real image is formed 20 cm from the lens.
What angular magnification is produced by this lens when it is used as a
In a compound microscope, the focal lengths of
the objective and eyepiece are +0.50 cm and +2.0 cm respectively.
The instrument is focused on an object 0.52 cm from the objective lens.
Compute the magnifying power of the microscope.
Now go to Canvas, Assignments, Extra Credit 10. Use the simulation to help
you answer questions 1 - 5. You can submit twice and the highest score counts.