Problems on Mirrors and Lenses
Problem 3.1:
Where is the image of an object placed 7 centimeters away from a 5 centimeter focal length convex lens? Concave mirror?
Are the images real or virtual in each case?
[Solution]
Problem 3.2:
Determine whether the images of the objects placed at the following positions will be upright or inverted. Concave mirror,
so = 2f; convex mirror,
f < so < 2f; concave lens,
f > so.
[Solution]
Problem 3.3:
Determine whether the images of the objects placed at the following positions will be enlarged or
diminished. Concave mirror,
so = f; convex mirror,
f < so < 2f; concave lens,
so > 2f. Also determine whether
the images are real or virtual.
[Solution]
Problem 3.4:
Use what you know about geometric optics to decide what type of lens is used in a magnifying glass and describe how it works.
[Solution]
Problem 3.5:
A diagram of a Keplerian telescope is shown in the figure below. Note that the objective lens and
eyepiece lens share a focal plane. The image formed by the objective must be in the region beyond the focal plane of the
eyepiece lens. Compute the transverse magnification of such a telescope in terms of the focal lengths of the two lenses.
Figure AK.1: A ray diagram of a Keplerian telescope.
[Solution]
[Solution]
