Question

a) Can a diverging lens be used as a magnifier?

b) What is the maximum value that the focal length of a magnifying lens can have?

c) A magnifier has a magnification of 5X. How far from the lens should an object be held so that its image is at the near-point distance of 25 cm?

Answer #1

A converging lens and a diverging lens, separated by a distance
of 30.0 cm, are used in combination. The converging lens has a
focal length of 15.2 cm. The diverging lens is of unknown focal
length. An object is placed 19.3 cm in front of the converging
lens; the final image is virtual and is formed 12.0 cm in front of
the diverging lens. What is the focal length of the diverging
lens?

1. The focal lengths of the objective and the eyepiece of a
microscope are 0.50 cm and 2.0 cm, respectively, and their
separation adjusted for minimum eyestrain (with the final image at
the viewer's far point) is 6.0 cm. The near point of the person
using the microscope is 25 cm and the far point is infinity.
a. If the microscope is focused on a small object, what is the
distance between the object and the objective lens?
b. If...

An
object is placed 5cm in front of a diverging lens of focal length
25 cm. A second converging lens of focal length 15cm is positioned
20 cm to the right of the first lens. What is the final image
distance? What is the magnification of the final image? Is it
upright of inverted? Real or virtual?

An object is a distance 15.6cm to the left of a diverging lens
("Lens 1") with a focal length of -19cm. Lens 1 is itself a
distance 29cm to the left of a second diverging lens ("Lens 2")
with a focal length -19cm.
The object is along the optical axis of the two-lens system.
How far is the image of the object due to Lens 2 away from Lens
2? Note that in this case the light has passed through...

A converging lens with a focal length of 20 cm and a diverging
lens with a focal length of -34 cm are 74.0 cm apart. A 2.6-cm-tall
object is 40 cm in front of the converging lens.
1. Calculate the distance between image and diverging lens.
2. Calculate the image height.

1) The distance from the lens to the retina is 3.1 cm, what is
the effective focal length of the lens when staring at an object
infinitely far away?
2) An object is moved to 40cm from the eye. What must the focal
length of the eye be to focus the image on the retina?
3) In the near sighted eye, images focus before hitting the
retina. Suppose the focal length of the lens is 1.9 cm, while the
distance...

The distance between an object and its image formed by a
diverging lens is 47.7 cm. The focal length of the lens is -237.3
cm. (a) Find the image distance. cm (b) Find the object distance.
cm

Q 26: Determine the lens separation and object
location for a microscope made from an objective lens of focal
length +0.70-cm and an eyepiece of focal length +4.0-cm. Arrange
the lenses so that a final virtual image is formed 100 cm to the
left of the eyepiece and so that the angular magnification is -260
for a person with a near point of 25 cm.
Part A: Determine the object distance from the
objective lens.
Part B: Determine the distance between the...

A diverging lens has a focal length of magnitude 21.8 cm.
(a) Locate the images for each of the following object
distances.
43.6 cm
distance
cm
location
---Select--- in front of the lens behind the lens
21.8 cm
distance
cm
location
---Select--- in front of the lens behind the lens
10.9 cm
distance
cm
location
---Select--- in front of the lens behind the lens
(b) Is the image for the object at distance 43.6 real or
virtual?
realvirtual
Is the...

A diverging lens has a focal length of magnitude 17.6 cm.
(a) Locate the images for each of the following object
distances.
35.2 cm
distance
cm
location
---Select--- in front of the lens behind the lens
17.6 cm
distance
cm
location
---Select--- in front of the lens behind the lens
8.8 cm
distance
cm
location
---Select--- in front of the lens behind the lens
(b) Is the image for the object at distance 35.2 real or
virtual?
realvirtual
Is the...

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