Question

A telescope works by taking a distant object, creating an image at the focal point with the objective lens, and then having the eyepiece lens use that image as its object to create a second image at infinity. Why infinity? So that you don’t need to put your eye in any particular place to see it, and it looks like any other distant object.

Q0.1. If both lenses are converging, what should the theoretical magnification be, positive or negative? If you want an upright image, what combination of lenses do you need?

Answer #1

Generally incase of an aastronomical telescope which is
mentioned in the problem here ,final image formed for eye piece is
**inverted** since the final image is formed at
infinity. Hence theoretical magnification formed is
**Negative** .

To have an upright image a **convex lens or converging
lens of magnification -1** should be placed in between
objective and eyepiece.So that final image formed is Errect or
Upright. This tyype of telescope where errecting lens are used is
called Terrestrial telescope.

The angular magnification of a refracting telescope is 40. When
the object and final image are both at infinity, the distance
between the eyepiece and the objective is 143.5 cm. The telescope
is used to view a distant radio tower. The real image of the tower,
formed by the objective, is 6.0 mm in height. The focal point of
the eyepiece is positioned at the real image. What is the angle
subtended by the final image of the tower?
a:...

The focal length of the objective lens in a microscope is 0.270
cm, and an object is placed 0.275 cm from the objective.
a. How far from the objective lens will the objective image be
formed?
b. If the image of this object is viewed with the eyepiece
adjusted for minimum eyestrain (image at the far point of the eye)
for a person with normal vision. What is the needed focal length of
the eyepiece lens if the distance between...

Build a microscope that can double the size of an object. We
need to choose two converging lenses from these available lenses
with focal lengths 2,4,8, and 12 meters.
First choose an objective lens focal length, and a distance to
place the object from the lens.
Then choose an eyepiece lens focal length and a distance to
place the lens from the objective lens.
Draw your microscope design including a ray diagram.
Your diagram should include:
1. Location and properties...

Please explain, walkthrough, and show equations.
The focal length of the objective lens in a microscope is 0.270
cm, and an object is placed 0.275 cm from the objective.
a. How far from the objective lens will the objective image be
formed?
b. If the image of this object is viewed with the eyepiece
adjusted for minimum eyestrain (image at the far point of the eye)
for a person with normal vision. What is the needed focal length of
the...

To determine focal lengths of converging lenses we can focus an
image of a distant object (ex: the trees outside) on a white card.
Explain how this yields the focal length. Can this method be used
for diverging lenses?

If the image is on the same side of the lens as the object the
image distance is negative by convention
Magnifier
Where is it located with respect to the lens and the
object?
telescope
The key to understanding a telescope is to remember that the
purpose is to gather light from distant objects. The image from the
primary lens is magnified by a second lens to increase its size.
Why should you use a longer focal length lens as...

The eyepiece of a compound microscope has a focal length of 2.90
cm , and the objective lens has f = 0.720 cm . An object is placed
0.810 cm from the objective lens. Assume a normal eye and that the
final image is at infinity.
a)Calculate the distance between the lenses when the microscope
is adjusted for a relaxed eye.
Express your answer to two significant figures and include the
appropriate units.
b)Calculate the total magnification.
Express your answer...

DataTable 1
Focal length, f
1.76
2f
3.52
Height of object, ho
4.0
Data Table 2
General Description
Object Dist. (cm)
Image Dist. (cm)
Object Size (cm)
Image Size (cm)
Other Observations (real, virtual or no image?) (Upright or
inverted image?)
Object about 5 f
10
74.04
4
-29.62
Real, inverted
Object about 2.5f
10
7.87
4
-3.15
Real, inverted
Object 2f
10
5.44
4
-2.18
Real, inverted
More than f and less than 2f
10
4.29
4
-1.71
Real,...

Imagine you have two lenses at your disposal, lens A of focal
length 18 cm and lens B of focal length -14 cm.
a)An object is placed 33 cm to the left of lens A. Where is the
image located?
b)Now, lens B is also placed 12 cm to the right of lens A. Where
is the final image of the lens combination located?
c) What is the total magnification?
Please be detailed with part B please! (u dont need...

Your little sister currently thinks all things insectoid are
really cool, and you want to give her a microscope so she can look
at butterfly wings. However, you are a broke college student, so
you need to build it yourself. You buy two thin lenses: one with a
focal length f = 2.0 cm and the other with f = 1.0 cm.
a. Which lens has a higher power P? You will use this lens as
the objective.
b. You’ve...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 31 minutes ago

asked 42 minutes ago

asked 52 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago