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Physics 262  exam#2
3/9
1.
(25pts) Answer the following questions.
Justify your answers.
(Use the
space provided below and the next page)
a). (9pts) An object (an arrow) is placed as shown in front of each of the following
optical instruments.
Describe the image produced in each of the following three cases
according to the following three sets of identifiers: real/virtual, upright/inverted, and
larger/smaller?
b). (6pts) The graph on the right is the
intensity
distribution
from
a
Young’s doubleslit experiment.
Every 4
th
interference peaks are
observed to be missing from the
pattern.
If the width for both slits is
known,
a
= 20.0
m, what is the
separation between the two slits
d
.
c). (6pts)
i. With a real object, can a convex mirror produce a real image?
ii.With a real object, can a diverging lens produce an inverted image?
d). (9pts) A real object is placed in front of a convex mirror.
If one wants to have a
bigger image, should one move the object closer to or farther away from the mirror?
Answers:
a)
i) virtual, upright, and smaller
ii) real, inverted, and larger
iii) virtual, upright, and larger
b)
The interference maxs are given by
sin
dm
and the diffraction mins
(envelope) are given by
sin
'
am
.
We are told that every 4
th
interference
maxs are missing from the pattern and this means that every 4
th
interference maxs
are located at the same angular location
as the diffraction mins.
This implies
that
/
'
4
mm
.
Putting this condition into the two equations, we can see that
44
4
2
0
8
0
'
da
m
m
c)
i. No.
For a real object, all images from a convex mirror are virtual.
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This note was uploaded on 05/10/2010 for the course PHYSICS 262 taught by Professor Paulso during the Spring '10 term at George Mason.
 Spring '10
 paulso
 Physics

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