- #1
indiansfan4life
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A) A student places a light bulb 30 cm in front of a concave mirror. A real image of the bulb is found 6 cm in front of the mirror. What is the focal length of the mirror?
my answer was 5 cm
Given
-----
do=30cm
di=6cm
f=?
f=dodi/do+di
f=30*6/30+6
=5
B) If a light bulb is place 12 cm in front of a concave mirror with a focal length of 3 cm. How far in front of the mirror will the real image of the light bulb be found?
my answer was 4 cm
Given
-----
do=12cm
f=3cm
di=?
di=dof/do-f
di=12cm*3cm/12cm-3cm
=4
H) How did the location of the image change as you moved the object (light bulb) toward a mirror?
increased
I) how did the size of the image change as you moved the object toward the mirror?
increased in size
-----------------------------
A) A student places a light bulb 12 cm in front of a double convex lens. A real image of the bulb is found 3 cm on the other side of the lens. What is the focal length of the lens?
my answer was 2.4 cm
Given
-----
do=12cm
di=3cm
f=?
f=dodi/do+di
f=12*3/12+3
=2.4
B) A light bulb is place 30 cm in front of a double convex lens with a focal length of 6 cm. How far on the other side of the lens will the real image of the light bulb be found?
my answer was 7.5 cm
Given
-----
do=30cm
f=6cm
di=?
di=dodf/do-f
di=30*6/30-6
=7.5
H) How did the location of an image change as you moved the object (light bulb) toward a lens?
decreased
I) How did the size of the image change as you moved the object toward the lens?
it also decreased in size
thanks
my answer was 5 cm
Given
-----
do=30cm
di=6cm
f=?
f=dodi/do+di
f=30*6/30+6
=5
B) If a light bulb is place 12 cm in front of a concave mirror with a focal length of 3 cm. How far in front of the mirror will the real image of the light bulb be found?
my answer was 4 cm
Given
-----
do=12cm
f=3cm
di=?
di=dof/do-f
di=12cm*3cm/12cm-3cm
=4
H) How did the location of the image change as you moved the object (light bulb) toward a mirror?
increased
I) how did the size of the image change as you moved the object toward the mirror?
increased in size
-----------------------------
A) A student places a light bulb 12 cm in front of a double convex lens. A real image of the bulb is found 3 cm on the other side of the lens. What is the focal length of the lens?
my answer was 2.4 cm
Given
-----
do=12cm
di=3cm
f=?
f=dodi/do+di
f=12*3/12+3
=2.4
B) A light bulb is place 30 cm in front of a double convex lens with a focal length of 6 cm. How far on the other side of the lens will the real image of the light bulb be found?
my answer was 7.5 cm
Given
-----
do=30cm
f=6cm
di=?
di=dodf/do-f
di=30*6/30-6
=7.5
H) How did the location of an image change as you moved the object (light bulb) toward a lens?
decreased
I) How did the size of the image change as you moved the object toward the lens?
it also decreased in size
thanks