Question 1

Using a camera with a fixed focal length lens,how will decreasing the f-number affect the depth of field and the intensity of the light reaching the ccd (or film)?

Accepted Answer

A) The depth of field will increase as will the intensity of light reaching the ccd. 
B) The depth of field will increase but the intensity of light reaching the ccd will decrease. 
C) The depth of field will decrease as will the intensity of light reaching the ccd. 
D) The depth of field will decrease but the intensity of light reaching the ccd will increase. 
A) The depth of field will increase as will the intensity of light reaching the ccd. 
B) The depth of field will increase but the intensity of light reaching the ccd will decrease. 
C) The depth of field will decrease as will the intensity of light reaching the ccd. 
D) The depth of field will decrease but the intensity of light reaching the ccd will increase.

Question 2

A low f-number

Accepted Answer

A) allows a smaller depth of field. 
B) allows using a faster shutter speed. 
C) causes less spherical aberration. 
D) is not related to any of the above options. 
A) allows a smaller depth of field. 
B) allows using a faster shutter speed. 
C) causes less spherical aberration. 
D) is not related to any of the above options.

Question 3

A telescope has an objective lens with a focal length of 100 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?

Accepted Answer

A) 30 
B) 33 
C) 75 
D) 140 
E) ​103 
A) 30 
B) 33 
C) 75 
D) 140 
E) ​103

Question 4

A diverging lens will be prescribed by the eye doctor to correct which of the following?

Accepted Answer

A) myopia 
B) presbyopia 
C) hyperopia 
D) astigmatism 
A) myopia 
B) presbyopia 
C) hyperopia 
D) astigmatism

Question 5

What is the f-number of a camera lens that has an aperture-opening diameter of 0.30 cm and a focal length of 6.0 cm?

Accepted Answer

A) 0.30 
B) 1.8 
C) 20 
D) 6.0 
E) ​0.05 
A) 0.30 
B) 1.8 
C) 20 
D) 6.0 
E) ​0.05

Question 6

Young children that need glasses are rarely prescribed bifocals.Why?

Accepted Answer

A) They are almost always nearsighted. 
B) They are almost always farsighted. 
C) They have considerable accommodation power. 
D) Parents don't go for the additional expense. 
A) They are almost always nearsighted. 
B) They are almost always farsighted. 
C) They have considerable accommodation power. 
D) Parents don't go for the additional expense.

Question 7

You are building a compound microscope with an objective lens of focal length 0.60 cm and an eyepiece lens of focal length 5.0 cm.You mount the lenses 18 cm apart.What is the maximum magnification of your microscope?

Accepted Answer

A) 5 
B) 10 
C) 75 
D) 150 
E) ​18 
A) 5 
B) 10 
C) 75 
D) 150 
E) ​18

Question 8

Glaucoma occurs because

Accepted Answer

A) the eye cannot accommodate properly. 
B) the shape or size of the eye is not normal. 
C) there is too much pressure in the fluid in the eyeball. 
D) the lens is partially or totally opaque. 
A) the eye cannot accommodate properly. 
B) the shape or size of the eye is not normal. 
C) there is too much pressure in the fluid in the eyeball. 
D) the lens is partially or totally opaque.

Question 9

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−9 m)

Accepted Answer

A) 2,100 
B) 46 
C) 4,300,000 
D) 230 
E) ​684 
A) 2,100 
B) 46 
C) 4,300,000 
D) 230 
E) ​684

Question 10

You are designing eyeglasses for someone whose near point is 60 cm.What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?

Accepted Answer

A) −18 cm 
B) 18 cm 
C) 43 cm 
D) 60 cm 
E) ​-43 cm 
A) −18 cm 
B) 18 cm 
C) 43 cm 
D) 60 cm 
E) ​-43 cm

Question 11

The Palomar reflecting telescope has a parabolic mirror with an 80-m focal length.What is the magnification achieved when an eyepiece of focal length 2.5 cm is used?

Accepted Answer

A) 800 
B) 1,100 
C) 1,600 
D) 3,200 
E) ​2,000 
A) 800 
B) 1,100 
C) 1,600 
D) 3,200 
E) ​2,000

Question 12

In the normal eye the ciliary muscles that control the lens will relax

Accepted Answer

A) when viewing objects at the near point. 
B) when viewing objects at infinity. 
C) when viewing objects at a distance of 20 ft. 
D) only when a person has his/her eyes closed. 
A) when viewing objects at the near point. 
B) when viewing objects at infinity. 
C) when viewing objects at a distance of 20 ft. 
D) only when a person has his/her eyes closed.

Question 13

A nearsighted person cannot see objects clearly beyond 70 cm (the far point).If the patient has no astigmatism and contact lenses are prescribed,what is the power of the lens required to correct the patient's vision?

Accepted Answer

A) −0.7 diopters 
B) −1.4 diopters 
C) −2.9 diopters 
D) −7.0 diopters 
E) ​-700 diopters 
A) −0.7 diopters 
B) −1.4 diopters 
C) −2.9 diopters 
D) −7.0 diopters 
E) ​-700 diopters

Question 14

A CCD camera is equipped with a lens with constant focal length.As the f-number is decreased,which of the following quantities remain unchanged?​

Accepted Answer

A) ​the aperture 
B) ​the depth of field 
C) ​the appropriate exposure time 
D) ​the intensity of light reaching the sensor 
E) ​None of the above quantities remains unchanged. 
A) ​the aperture 
B) ​the depth of field 
C) ​the appropriate exposure time 
D) ​the intensity of light reaching the sensor 
E) ​None of the above quantities remains unchanged.

Question 15

A camera is used to photograph the full moon,which has an angular diameter of 0.53°.The image on the film is 2.3 mm in diameter.What is the focal length of the lens?

Accepted Answer

A) 2.3 mm 
B) 500 mm 
C) 250 mm 
D) 790 mm 
E) ​25.5 mm 
A) 2.3 mm 
B) 500 mm 
C) 250 mm 
D) 790 mm 
E) ​25.5 mm

Question 16

Which of the following primarily determines the resolution of a telescope?

Accepted Answer

A) the barrel length 
B) the focal length of the objective 
C) the diameter of the objective 
D) the diameter of the eyepiece 
A) the barrel length 
B) the focal length of the objective 
C) the diameter of the objective 
D) the diameter of the eyepiece

Question 17

A magnifier uses a

Accepted Answer

A) converging lens to form a real image. 
B) converging lens to form a virtual image. 
C) diverging lens to form a virtual image. 
D) diverging lens to form a real image. 
A) converging lens to form a real image. 
B) converging lens to form a virtual image. 
C) diverging lens to form a virtual image. 
D) diverging lens to form a real image.

Question 18

A person can see well in the distance,but cannot do so at an arm's-length distance.To correct this,lenses that are ________ having a ________ power could be used.

Accepted Answer

A) thicker at their center than at the edges,positive 
B) thicker at their center than at the edges,negative 
C) thinner at their center than at the edges,positive 
D) thinner at their center than at the edges,negative 
A) thicker at their center than at the edges,positive 
B) thicker at their center than at the edges,negative 
C) thinner at their center than at the edges,positive 
D) thinner at their center than at the edges,negative

Question 19

The pupil of a cat's eye narrows to a slit of width 0.5 mm in daylight.Assuming a wavelength of 500 nm,what is the angular resolution? (1 nm = 10−9 m)

Accepted Answer

A) 1 × 10−3 rad 
B) 5 × 10−3 rad 
C) 1 × 10−4 rad 
D) 5 × 10−4 rad 
E) ​2.5 × 10−4 rad 
A) 1 × 10−3 rad 
B) 5 × 10−3 rad 
C) 1 × 10−4 rad 
D) 5 × 10−4 rad 
E) ​2.5 × 10−4 rad

Question 20

Doubling the aperture diameter of a camera lens will change the f-number by what factor?

Accepted Answer

A) 1/4 
B) 1/2 
C) 2 
D) 4 
E) 1/​3 
A) 1/4 
B) 1/2 
C) 2 
D) 4 
E) 1/​3

Exam 25: Optical Instruments

Using a camera with a fixed focal length lens,how will decreasing the f-number affect the depth of field and the intensity of the light reaching the ccd (or film)?

A low f-number

A telescope has an objective lens with a focal length of 100 cm and an eyepiece of focal length 3.0 cm.What is the angular magnification of the telescope?

A diverging lens will be prescribed by the eye doctor to correct which of the following?

What is the f-number of a camera lens that has an aperture-opening diameter of 0.30 cm and a focal length of 6.0 cm?

Young children that need glasses are rarely prescribed bifocals.Why?

You are building a compound microscope with an objective lens of focal length 0.60 cm and an eyepiece lens of focal length 5.0 cm.You mount the lenses 18 cm apart.What is the maximum magnification of your microscope?

Glaucoma occurs because

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−9 m)

You are designing eyeglasses for someone whose near point is 60 cm.What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?

The Palomar reflecting telescope has a parabolic mirror with an 80-m focal length.What is the magnification achieved when an eyepiece of focal length 2.5 cm is used?

In the normal eye the ciliary muscles that control the lens will relax

A nearsighted person cannot see objects clearly beyond 70 cm (the far point).If the patient has no astigmatism and contact lenses are prescribed,what is the power of the lens required to correct the patient's vision?

A CCD camera is equipped with a lens with constant focal length.As the f-number is decreased,which of the following quantities remain unchanged?​

A camera is used to photograph the full moon,which has an angular diameter of 0.53°.The image on the film is 2.3 mm in diameter.What is the focal length of the lens?

Which of the following primarily determines the resolution of a telescope?

A magnifier uses a

A person can see well in the distance,but cannot do so at an arm's-length distance.To correct this,lenses that are ________ having a ________ power could be used.

The pupil of a cat's eye narrows to a slit of width 0.5 mm in daylight.Assuming a wavelength of 500 nm,what is the angular resolution? (1 nm = 10−9 m)

Doubling the aperture diameter of a camera lens will change the f-number by what factor?

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Filters

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−⁹ m)

A CCD camera is equipped with a lens with constant focal length.As the f-number is decreased,which of the following quantities remain unchanged?

A person can see well in the distance,but cannot do so at an arm's-length distance.To correct this,lenses that are having a power could be used.

The pupil of a cat's eye narrows to a slit of width 0.5 mm in daylight.Assuming a wavelength of 500 nm,what is the angular resolution? (1 nm = 10−⁹ m)