The
correct answer is identified by an asterisk
1.
If a person has an eye with a near point of 10 cm and a far point of 200 cm,
then
(a) The person has myopia and needs
eye glasses with a positive lens
*(b) The person has myopia and needs
eye glasses with a negative lens
(c) The person needs bifocals
(d) The person has hyperopia and needs
eye glasses with a positive lens
(e) The person has hyperopia and needs
eye glasses with a negative lens
2.
If a person has an eye with a near point of 50 cm and a far point of 60 cm,
then
(a) The person has myopia and needs
eye glasses with a positive lens
(b) The person has myopia and needs
eye glasses with a negative lens
(c) The person has hyperopia and needs
eye glasses with a positive lens
(d) The person has hyperopia and needs
eye glasses with a negative lens
*(e) The person needs bifocals
3.
If a person has an eye with a near point of 200 cm and a far point of infinity,
then
(a) The person has myopia and needs
eye glasses with a positive lens
(b) The person has myopia and needs
eye glasses with a negative lens
(c) The person needs bifocals
*(d) The person has hyperopia and
needs eye glasses with a positive lens
(e) The person has hyperopia and needs
eye glasses with a negative lens
4.
If a person has an eye that has no accommodation, then
(a) The person has myopia and needs eye glasses with
a positive lens
(b) The person has myopia and needs
eye glasses with a negative lens
*(c) The person needs bifocals
(d) The person has hyperopia and needs
eye glasses with a positive lens
(e) The person has hyperopia and needs
eye glasses with a negative lens
5.
Bifocals are eye glasses with lenses which have two focal lengths: one for
viewing objects at a distance and a second for viewing objects up close. When
bifocals are worn by a person who has had cataract surgery and has no
accommodation,
(a) The strength of the lens for
viewing objects at a distance is always negative
(b) The strength of the lens for
viewing objects at a distance is always positive
*(c) The strength of the lens for
viewing objects up close is always greater than the strength for viewing
objects at a distance
(d) The strength of the lens for
viewing objects up close is always less than the strength for viewing objects
at a distance
(e) None of these statements is always
true
6. An eyeglass lens made from a combination of
a positive lens and a cylinder lens would be used for
(a) a person whose eye has no
accommodation
(b) a person whose eye has astigmatism
and a normal near point
(c) a person whose eye has myopia and
astigmatism
*(d) a person whose eye has hyperopia
and astigmatism
(e) a person whose eye has presbyopia
7. A positive lens has a focal length of 5 cm.
If that lens is used as a simple magnifier, the magnification relative to the
eye acting alone is about
*(a) 5
(b) 10
(c) 0.5
(d) 0.2
(e) 12
8.
A compound microscope is made using
(a) a long focal length positive lens
for both the objective and the eye piece
*(b) a short focal length positive
lens for both the objective and the eye piece
(c) a long focal length positive lens
for the objective and a short focal length positive lens for the eye piece
(d) a short focal length positive lens
for the objective and a long focal length positive lens for the eye piece
(e) a positive lens for the objective
and a negative lens for the eye piece
9.
A Galilean telescope is made using
(a) a long focal length positive lens for both the
objective and the eye piece
(b) a short focal length positive lens
for both the objective and the eye piece
(c) a long focal length positive lens
for the objective and a short focal length positive lens for the eye piece
(d) a short focal length positive lens
for the objective and a long focal length positive lens for the eye piece
*(e) a positive lens for the objective
and a negative lens for the eye piece
10.
An astronomical telescope is made using
(a) a long focal length positive lens for both the
objective and the eye piece
(b) a short focal length positive lens
for both the objective and the eye piece
*(c) a long focal length positive lens
for the objective and a short focal length positive lens for the eye piece
(d) a short focal length positive lens
for the objective and a long focal length positive lens for the eye piece
(e) a positive lens for the objective and
a negative lens for the eye piece
Captain
Hook makes a Galilean telescope using two lenses of focal lengths +50 cm and
–10 cm.
11.
The separation between the two lenses should be
(a) 70 cm
(b) 60 cm
(c) 50 cm
*(d) 40 cm
(e) 30 cm
12.
The magnitude of the magnification will be
*(a) 5 and the image is erect
(b) 5 and the image is inverted
(c) 4 and the image is erect
(d) 4 and the image is inverted
(e) 6 and the image is erect