Quiz Lesson 4: Geometrical Optics and Thin Lenses

Note: You have only one chance in all the questions. Please be sure before answer.

For questions 1 – 4, use the following situation.  An object is placed 15 cm from a double convex lens whose focal distance is 10 cm. 

1.     The image of the object formed by the lens is

A)  Virtual and inverted
B)  Virtual and erect
C)  Real and inverted
D)     Real and erect

2.     How far from the lens is the image formed?

A)  30 cm
B)  2 cm
C)  80 cm
D)     18 cm

3.     The image is located:

A)  In front of the lens
B)  On the other side of the lens
C)     Directly on the lens
D) None

4.     The size of the image as compared to the object is:

A) A half
B)  Smaller
C)     Same Size
D) Two times the size of the object
E)  Larger

5.     As you move farther away from a plane mirror, the size of your image:

A)     Increases
B)      Decreases
C)      Remains the same

6.     A candle is placed at a distance more than twice the focal length of the mirror.  The image formed will be:

A)     Virtual and in front of the mirror
B)      Virtual and behind the mirror
C)     Real and in front of the mirror
D)     Real and behind the mirror

7.     The focal length of a mirror is 25 cm.  What is the radius of curvature of this mirror?

A)     15 m
B)      50 m
C)     .25 m
D)     .5 m

8.     An object 0.15 m meter tall is placed 0.2 meter to the left of the mirror.  If the image is located 0.4 meter to the left of the mirror, the size of the image will be:

A)     0.5 m
B)      0.7 m
C)      0.3 m
D)     0.1 m

9.     If a mirror’s radius of curvature were decreased, the focal length of the mirror would:

A)     increase
B)      Decrease
C)     Remain the Same

10.  An object is placed 0.5 meter from a lens and produces an imaged located 1.5 meters from the lens.  What is the focal length of the lens?

A)     0.38 m
B)      0.52 m
C)     1.5 m
D)     0.75 m

Count your correct answers.

If you have 7 or more points you can go to the next lesson.

If you obtained less than 7, we recommend that you repeat this lesson.