Focal length is the distance between the center of a convergent
lens and the focal point of the lens(the point where parallel rays
of light meet, or converge).
For converging and diverging lens types:
a. Explain what the “focal length” of a lens is.
b. What is the difference between converging and diverging lenses?
c. What is the relationship between the object distance and the image distance for a lens?
Q3- lens A to be a convex lens with a focal length of 20 cm,
lens B is concave lens with focal length of 15 cm a- Calculate and
compare the optical powers for lenses A, and B b- Find the combined
optical power if the two lenses were cascaded behind each other
Q4- Use ray tracing or Lens equation to find the image of an
object 1 cm high located at 2 cm away from a convex lens that...
An object is placed in front of a lens with focal length
f1, a second lens is placed at a distance of d from the
first lens and has focal length f2. Given that the
object has a height of h, find the height of the final image.
Lens 1, in a two-lens system, is converging with a focal length
+15.0 cm and Lens 2 is also converging, with a focal length of +5.0
cm. An object is placed 40.0 cm to the left of Lens 1, as shown. If
the two lenses are separated by 30.0 cm, where is the final image
in relation to Lens 2?
A converging lens with a focal length of 4.0cm is to the left of
a second identical lens. When a feather is placed 11cm to the left
of the first lens, the final image is the same size and orientation
as the feather itself.
What is the separation between the lenses?
Express your answer using two significant figures.
An object is 15.2 cm to the left of a lens with a focal length
of 10.2 cm. A second lens of focal length 11.8 cm is 39.27 cm to
the right of the first lens. The height of the object of is 2.1 cm.
What is the location of the final image with respect to the second
lens? What is the height of the image?
A converging lens has a focal length of 7.5 cm.
(a) What are the image distances for objects placed at the
following distances from the thin lens? Also, state if each image
is real or virtual, upright or inverted, and enlarged or diminished
in size.
Object Distance
Image Distance
Real/Virtual
Upright/Inverted
Enlarged/Same Size/Diminished in Size
5.0 cm
cm
---Select--- real virtual
---Select--- upright inverted
---Select--- enlarged same size diminished in size
14.5 cm
cm
---Select--- real virtual
---Select--- upright inverted...
You are to design a thin lens for eyeglasses that will have a
focal length of 10 cm. You only have tools that will allow you to
shape glass surfaces with the following radii for convex surfaces:
4, 8, 12, 16, 18, and 21 cm, and the following radii for concave
surfaces 3, 6, 7, 10, 12 and 14 cm. The glass to be used has an
index of refraction of 1.48. Determine a combination you can use to
make...
a. A camera has a lens with a focal length of 0.032 m. The
camera is set to an f-number of 5.6. The shutter speed (the amount
of time during which the aperture is open to expose the film) is
set to 0.35 s. What is the diameter of the camera's aperture?
b. If the camera is focused on an object that is 0.39 m away
from the lens, how far is the film behind the lens?
c. If the...