Light in front of a mirror=More light!!
A tall light bulb is placed a distance of from a double convex lens having a focal length of
Determine
(a) the image distance
(b) the image size.
Enter your answer as to 2 decimal places.
The answer is 20.81.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
h = 4.00 cm d = 45.7 cm f = 15.2 cm To determine the image distance, the lens equation must be used.
1/f = 1/do + 1/di
1/(15.2 cm) = 1/(45.7 cm) + 1/di
0.0658 cm-1 = 0.0219 cm-1 + 1/di
0.0439 cm-1 = 1/di
di = 22.8 cm
hi/ho = - di/do
hi /(4.00 cm) = - (22.8 cm)/(45.7 cm)
hi = - (4.00 cm) • (22.8 cm)/(45.7 cm)
hi = -1.99 cm