Question 1

A compound microscope has three possible objective lenses and two eyepiece lenses For maximum angular magnification,the objective (f₀)and eyepiece (fe)should be chosen such that A) f₀ and fe are both the largest available. B) f₀ and fe are both the smallest available. C) f₀ is the largest available: fe is the smallest available. D) f₀ is the is the smallest available: fe is the largest available.

Accepted Answer

For maximum angular magnification in a compound microscope, the objective lens should have the smallest focal length, and the eyepiece should have the largest focal length.

Question 2

A pinhole camera is used to produce an image of a bird that is 3.8 m from the pinhole,onto the projection screen.If the size of the bird's image is 3.0% of the size of the bird,what is the distance from pinhole to screen?
A) 5.7 cm
B) 23 cm
C) 11 cm
D) impossible to determine given the information.

Accepted Answer

The answer of A pinhole camera is used to produce...

Question 3

How is chromatic aberration corrected in large astronomical reflecting telescopes?
A) a combination of lenses designed to cancel the aberrations
B) use a parabolic mirror instead of a spherical mirror
C) a properly constructed telescope has no aberration
D) change the resolution of the telescope

Accepted Answer

The answer of How is chromatic aberration corrected in large...

Question 4

Which statement best explains why we are able to see details of a distant object more clearly?
A) the image formed by the telescope is larger than the object
B) the image formed by the telescope subtends a larger angle at the eye than the object does
C) the intermediate image formed by the objective lens is greatly magnified
D) both the objective and eyepiece form real images

Accepted Answer

The image formed by the telescope subtends a larger angle at the eye than the object does. This means that the telescope gathers more light from the object and focuses it onto a smaller area in our eye, making the details appear clearer.

Question 5

An astronomical telescope has a barrel length of 33 cm and an angular magnification of 10.What are the focal lengths of the objective and the eyepiece in that order?
A) 0.3 m, 3 m
B) 30 cm, 3 cm
C) 20 cm,13 cm
D) 3 cm, 30 cm

Accepted Answer

The angular magnification (M) of an astronomical telescope is given by the ratio of the focal length of the objective (f₀) to the focal length of the eyepiece (fₑ) as follows:

M = -f₀ / fₑ

Also, the total length of the telescope (L) is the sum of the focal lengths:

L = f₀ + fₑ

Substituting the given values of L and M, we get:

10 = -f₀ / fₑ
33 cm = f₀ + fₑ

Solving these equations simultaneously, we get:

f₀ = 30 cm
fₑ = 3 cm

Therefore, the best choice is B, which gives the correct focal lengths in centimeters for the objective and the eyepiece, respectively.

Question 6

Reflecting telescopes may suffer with what kind of aberration(s)?
A) spherical
B) chromatic
C) spherical and chromatic
D) cinematic
E) Brewster and parabolic

Accepted Answer

Reflecting telescopes may suffer from spherical aberration, which occurs when the reflected light from the mirror does not converge into a single focal point, resulting in a blurry image. Chromatic aberration, on the other hand, is more commonly associated with refracting telescopes. Cinematic, Brewster, and parabolic aberrations are not relevant to telescope optics.

Question 7

A TEM is a nonoptical microscope.What does TEM stand for?
A) transverse electron magnifier
B) telescopic emulation machine
C) triple emission magnifier
D) transmission electron microscope
E) none of these answers are correct

Accepted Answer

TEM stands for Transmission Electron Microscope, which uses beams of electrons to create images of samples. Options A, B, and C are not correct.

Question 8

An astronomical telescope has a magnifying power of 200$\times$ when operated with a 3.50 cm eyepiece.What is the focal length of the objective of this telescope?
A) 204 cm
B) 196 cm
C) 700 cm
D) 57.0 cm
E) 30.0 cm

Accepted Answer

The answer of An astronomical telescope has a magnifying power...

Question 9

Which of the following is not necessarily true about the image produced by a pinhole camera?
A) The image is inverted
B) The image is smaller than the object
C) The image is real
D) None of the above is absolutely required
E) All of the above are absolutely required

Accepted Answer

The answer of Which of the following is not necessarily...

Question 10

An astronomical telescope is made with lenses of focal lengths 80.0 and 2.00 cm.What is the barrel length on this telescope?
A) 80.0 cm
B) 82.0 cm
C) 78.0 cm
D) 105 cm
E) 127 cm

Accepted Answer

The barrel length of a telescope is given by the sum of the focal lengths of its lenses. Therefore, the barrel length of this telescope is:
80.0 cm + 2.00 cm = 82.0 cm
Thus, the correct choice is B.

Question 11

The objective of an astronomical telescope has a focal length of 900 mm.The telescope has eyepieces of focal lengths 20 mm,15 mm,and 10 mm.What is the highest magnification for this telescope?
A) 920$\times$
B) 900$\times$
C) 880$\times$
D) 90$\times$
E) 60$\times$

Accepted Answer

The answer of The objective of an astronomical telescope has...

Question 12

A compound microscope gives a magnification of 200 $\times$ with an eyepiece of focal length 2.00 cm.If the eyepiece is replaced with an eyepiece of focal length 1.50 cm,what magnification results?
A) 150$\times$
B) 133$\times$
C) 89$\times$
D) 267$\times$
E) 300$\times$

Accepted Answer

The magnification of a compound microscope is inversely proportional to the focal length of the eyepiece. If the focal length is reduced from 2.00 cm to 1.50 cm, the magnification increases by a factor of 2.00/1.50 = 4/3. Therefore, the new magnification is 200 $\times$ (4/3) = 267$\times$.

Question 13

An astronomical telescope operates at 100 power using a 2.00 cm eyepiece.How long is the barrel of the telescope?
A) 52.0 cm
B) 100 cm
C) 102 cm
D) 200 cm
E) 202 cm

Accepted Answer

The answer of An astronomical telescope operates at 100 power...

Question 14

An astronomical telescope is made with lenses of focal lengths 80.0 and 1.25 cm.What magnifying power does this telescope provide?
A) 10
B) 81
C) 79
D) 64
E) 41

Accepted Answer

The answer of An astronomical telescope is made with lenses...

Question 15

What causes chromatic aberration?
A) the index of refraction is a function of wavelength
B) the outer edges of the lens produce a focus at a different point from the central rays
C) the absorption of light in the glass is a function of wavelength
D) the coefficient of reflection is a function of wavelength

Accepted Answer

Chromatic aberration is caused by the index of refraction being different for different wavelengths of light. This causes different colors of light to be refracted at slightly different angles, leading to a blurring or separation of colors in the image.

Question 16

An astronomical telescope is made with lenses of focal length 80.0 cm and 2.00 cm.Two stars in the sky are separated by 0.080$^{\circ}$.What angle of separation do they have when viewed in the telescope?
A) 40$^{\circ}$
B) 6.4$^{\circ}$
C) 3.2$^{\circ}$
D) 1.6$^{\circ}$
E) 0.080$^{\circ}$

Accepted Answer

The angle of separation between the stars can be found using the formula:

θ = tan-1 (d/f)

where θ is the angle of separation, d is the distance between the stars, and f is the focal length of the telescope.

Plugging in the values given:

d = 0.080 m
f = 0.80 m (the longer focal length of the two lenses)

θ = tan-1 (0.080/0.80)
θ = tan-1 (0.1)
θ = 5.7°

Therefore, the answer is closest to choice C, which is 3.2°.

Question 17

There are two lenses in a microscope because
A) the objective is a converging lens and the eyepiece is a diverging lens.
B) the objective is a diverging lens and the eyepiece is a diverging lens.
C) the objective is a diverging lens and the eyepiece is a converging lens.
D) the objective is a converging lens and the eyepiece is a converging lens.

Accepted Answer

In a microscope, both the objective and the eyepiece are converging lenses, which work together to magnify the image of the specimen.

Question 18

A telescope is set up in introductory physics lab using a 10 cm lens and a 50 cm lens.Since both lenses are the same diameter it is not evident which one to use as the eyepiece and which one to use as the objective.If one uses the 50 cm lens as the eyepiece,what power results?
A) 500$\times$
B) 5$\times$
C) 0.2$\times$
D) 0.002$\times$
E) one cannot look through the system in this direction

Accepted Answer

The answer of A telescope is set up in introductory...

Question 19

A fixed focus camera has a focal length of 35.0 mm.How far must the lens be moved in order to change focus from an object that is 20.0 m away to one that is 3.0 m away?
A) 0.34 mm
B) 0.41 mm
C) 0.35 mm
D) 0.47 mm

Accepted Answer

A fixed focus camera has a fixed focal length, meaning that the distance between the lens and the image sensor is set at a specific distance for a specific focus. Therefore, the lens cannot be moved to change focus. Hence, the answer is none of the options given.

Question 20

What causes spherical aberration?
A) the lens surface is not perfectly smooth
B) the outer edges of the lens produce a focus at a different point than the central rays
C) light is an electromagnetic wave with intrinsic diffraction properties
D) the absorption of light in the glass is a function of wavelength

Accepted Answer

Spherical aberration occurs when the outer edges of a lens produce a focus at a different point than the central rays. This is because the curvature of the lens is not consistent across its entire surface.

Quiz 24: Optical Instruments

A compound microscope has three possible objective lenses and two eyepiece lenses For maximum angular magnification,the objective (f₀) and eyepiece (fe) should be chosen such that

A pinhole camera is used to produce an image of a bird that is 3.8 m from the pinhole,onto the projection screen.If the size of the bird's image is 3.0% of the size of the bird,what is the distance from pinhole to screen?

How is chromatic aberration corrected in large astronomical reflecting telescopes?

Which statement best explains why we are able to see details of a distant object more clearly?

An astronomical telescope has a barrel length of 33 cm and an angular magnification of 10.What are the focal lengths of the objective and the eyepiece in that order?

Reflecting telescopes may suffer with what kind of aberration(s) ?

A TEM is a nonoptical microscope.What does TEM stand for?

An astronomical telescope has a magnifying power of 200 $\times$ when operated with a 3.50 cm eyepiece.What is the focal length of the objective of this telescope?

Which of the following is not necessarily true about the image produced by a pinhole camera?

An astronomical telescope is made with lenses of focal lengths 80.0 and 2.00 cm.What is the barrel length on this telescope?

The objective of an astronomical telescope has a focal length of 900 mm.The telescope has eyepieces of focal lengths 20 mm,15 mm,and 10 mm.What is the highest magnification for this telescope?

A compound microscope gives a magnification of 200 $\times$ with an eyepiece of focal length 2.00 cm.If the eyepiece is replaced with an eyepiece of focal length 1.50 cm,what magnification results?

An astronomical telescope operates at 100 power using a 2.00 cm eyepiece.How long is the barrel of the telescope?

An astronomical telescope is made with lenses of focal lengths 80.0 and 1.25 cm.What magnifying power does this telescope provide?

What causes chromatic aberration?

An astronomical telescope is made with lenses of focal length 80.0 cm and 2.00 cm.Two stars in the sky are separated by 0.080 $^{\circ}$ .What angle of separation do they have when viewed in the telescope?

There are two lenses in a microscope because

A telescope is set up in introductory physics lab using a 10 cm lens and a 50 cm lens.Since both lenses are the same diameter it is not evident which one to use as the eyepiece and which one to use as the objective.If one uses the 50 cm lens as the eyepiece,what power results?

A fixed focus camera has a focal length of 35.0 mm.How far must the lens be moved in order to change focus from an object that is 20.0 m away to one that is 3.0 m away?

What causes spherical aberration?