Question 1

The image formed by a single concave lens

Accepted Answer

A) is always real. 
B) is always virtual. 
C) could be real or virtual,depending on whether the object distance is smaller or greater than the focal length. 
D) could be real or virtual,but is always real when the object is placed at the focal point. 
E) is always inverted. 
A) is always real. 
B) is always virtual. 
C) could be real or virtual,depending on whether the object distance is smaller or greater than the focal length. 
D) could be real or virtual,but is always real when the object is placed at the focal point. 
E) is always inverted.

Question 2

Which statements about images are correct? (There could be more than one correct choice. )

Accepted Answer

A) A virtual image cannot be formed on a screen. 
B) A virtual image cannot be viewed by the unaided eye. 
C) A virtual image cannot be photographed. 
D) A real image must be erect. 
E) Mirrors always produce real images because they reflect light. 
A) A virtual image cannot be formed on a screen. 
B) A virtual image cannot be viewed by the unaided eye. 
C) A virtual image cannot be photographed. 
D) A real image must be erect. 
E) Mirrors always produce real images because they reflect light.

Question 3

Which of the following terms describe lenses that are thinner at the center than at the edges? (There could be more than one correct choice. )

Accepted Answer

A) converging lenses 
B) diverging lenses 
C) concave lenses 
D) convex lenses 
A) converging lenses 
B) diverging lenses 
C) concave lenses 
D) convex lenses

Question 4

A beam of light in water (of refractive index of 1.33)enters a glass slab (of refractive index 1.50)at an angle of incidence of 60.0°.What is the angle of refraction in the glass?

Accepted Answer

A) 27.5° 
B) 39.8° 
C) 60.0° 
D) 90.0° 
E) 50.2° 
A) 27.5° 
B) 39.8° 
C) 60.0° 
D) 90.0° 
E) 50.2°

Question 5

A concave spherical mirror has a focal length of magnitude 20 cm.An object is placed 30 cm in front of the mirror on the mirror's axis.Where is the image located?

Accepted Answer

A) 12 cm behind the mirror 
B) 12 cm in front of the mirror 
C) 60 cm behind the mirror 
D) 60 cm in front of the mirror 
A) 12 cm behind the mirror 
B) 12 cm in front of the mirror 
C) 60 cm behind the mirror 
D) 60 cm in front of the mirror

Question 6

A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal.What is the index of refraction of the plastic?

Accepted Answer

A) 0.74 
B) 1.11 
C) 1.28 
D) 1.36 
A) 0.74 
B) 1.11 
C) 1.28 
D) 1.36

Question 7

A convex lens has focal length f.If an object is placed at a distance beyond 2f from the lens on the principal axis,the image is located at a distance from the lens

Accepted Answer

A) of 2f. 
B) between f and 2f. 
C) of f. 
D) between the lens and f. 
E) of infinity. 
A) of 2f. 
B) between f and 2f. 
C) of f. 
D) between the lens and f. 
E) of infinity.

Question 8

Suppose you place an object in front of a concave mirror.Which of the following statements must be true? (There could be more than one correct choice. )

Accepted Answer

A) The image of the object will always be smaller than the object. 
B) No matter where you place the object,a real image of the object will be formed. 
C) The image of the object will always be inverted. 
D) If you position the object between the mirror and the focal point of the mirror,its image must be upright and virtual. 
E) No matter where you place the object,the image of the object will always be virtual and upright. 
A) The image of the object will always be smaller than the object. 
B) No matter where you place the object,a real image of the object will be formed. 
C) The image of the object will always be inverted. 
D) If you position the object between the mirror and the focal point of the mirror,its image must be upright and virtual. 
E) No matter where you place the object,the image of the object will always be virtual and upright.

Question 9

If a spherical convex mirror has a radius of curvature R,the magnitude of its focal length is

Accepted Answer

A) R/2. 
B) R/4. 
C) R. 
D) 2R. 
E) 4R. 
A) R/2. 
B) R/4. 
C) R. 
D) 2R. 
E) 4R.

Question 10

Light goes from material having a refractive index of n1 into a material with refractive index n2.If the refracted light is bent away from the normal,what can you conclude about the indices of refraction?

Accepted Answer

A) n1 > n2 
B) n1 ≥ n2 
C) n1 2 
D) n1 ≤ n2 
E) n1 = n2 
A) n1 > n2 
B) n1 ≥ n2 
C) n1 2 
D) n1 ≤ n2 
E) n1 = n2

Question 11

An object is placed in front of a thin lens.Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice. )

Accepted Answer

A) If the lens is convex,the image will never be virtual. 
B) If the image is real,then it is also inverted. 
C) If the image is real,then it is also upright. 
D) If the lens is concave,the image must be virtual. 
E) If the lens is convex,the image must be real. 
A) If the lens is convex,the image will never be virtual. 
B) If the image is real,then it is also inverted. 
C) If the image is real,then it is also upright. 
D) If the lens is concave,the image must be virtual. 
E) If the lens is convex,the image must be real.

Question 12

Which one of the following numbers is the correct magnification produced by a plane mirror?

Accepted Answer

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

Question 13

A seed is 15 mm in front of a converging lens,and the image of the seed is 4.0 mm behind the lens.What is the focal length of the lens?

Accepted Answer

A) 11 mm 
B) 5.5 mm 
C) 3.8 mm 
D) 3.2 mm 
A) 11 mm 
B) 5.5 mm 
C) 3.8 mm 
D) 3.2 mm

Exam 26: Geometrical Optics

The image formed by a single concave lens

Which statements about images are correct? (There could be more than one correct choice. )

Which of the following terms describe lenses that are thinner at the center than at the edges? (There could be more than one correct choice. )

A beam of light in water (of refractive index of 1.33)enters a glass slab (of refractive index 1.50)at an angle of incidence of 60.0°.What is the angle of refraction in the glass?

A concave spherical mirror has a focal length of magnitude 20 cm.An object is placed 30 cm in front of the mirror on the mirror's axis.Where is the image located?

A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal.What is the index of refraction of the plastic?

A convex lens has focal length f.If an object is placed at a distance beyond 2f from the lens on the principal axis,the image is located at a distance from the lens

Suppose you place an object in front of a concave mirror.Which of the following statements must be true? (There could be more than one correct choice. )

If a spherical convex mirror has a radius of curvature R,the magnitude of its focal length is

Light goes from material having a refractive index of n1 into a material with refractive index n2.If the refracted light is bent away from the normal,what can you conclude about the indices of refraction?

An object is placed in front of a thin lens.Which statements are correct in describing the image formed by the lens? (There could be more than one correct choice. )

Which one of the following numbers is the correct magnification produced by a plane mirror?

A seed is 15 mm in front of a converging lens,and the image of the seed is 4.0 mm behind the lens.What is the focal length of the lens?

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Light goes from material having a refractive index of n₁ into a material with refractive index n₂.If the refracted light is bent away from the normal,what can you conclude about the indices of refraction?