Question 1

Your eye looks into a thick glass slab at an air bubble located at point 3. The bubble appears to be at point

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5 B

Question 2

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the magnification of the final image.

Accepted Answer

A)  15 
B)  6.3 
C)  22 
D)  32 
E)  47 
A)  15 
B)  6.3 
C)  22 
D)  32 
E)  47 D

Question 3

An object 25 cm from a convex mirror is observed to produce an image 13.6 cm behind the mirror. What is the focal length of the mirror?

Accepted Answer

A)  8.8 cm 
B)  -8.8 cm 
C)  30 cm 
D)  -30 cm 
E)  -60 cm 
A)  8.8 cm 
B)  -8.8 cm 
C)  30 cm 
D)  -30 cm 
E)  -60 cm D

Question 4

One ray is shown as it leaves an object placed before a positive lens. If this ray were continued to show its path through the lens, it would pass through point

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 5

A spherical mirror exhibits

Accepted Answer

A)  both chromatic and spherical aberrations. 
B)  neither chromatic nor spherical aberration. 
C)  spherical but not chromatic aberration. 
D)  chromatic but not spherical aberration. 
E)  The type of aberration depends on the shape of the spherical surface. 
A)  both chromatic and spherical aberrations. 
B)  neither chromatic nor spherical aberration. 
C)  spherical but not chromatic aberration. 
D)  chromatic but not spherical aberration. 
E)  The type of aberration depends on the shape of the spherical surface.

Question 6

A simple refracting telescope has an objective of focal length 75 cm and an eyepiece of focal length 3.0 cm. When viewed by the naked eye, the moon subtends an angle of about 0.009 radians. What angle is subtended by the moon when it is viewed through this telescope?

Accepted Answer

A)  0.022 rad 
B)  0.22 rad 
C)  3.6 * 10-4 rad 
D)  0.078 rad 
E)  3.0 * 10-3 rad 
A)  0.022 rad 
B)  0.22 rad 
C)  3.6 * 10-4 rad 
D)  0.078 rad 
E)  3.0 * 10-3 rad

Question 7

A short sighted person's range of vision is between 12 cm and 35 cm from the eye. What strength lens (in Diopters) is needed to move her near point to 25 cm?

Accepted Answer

A)  -3.4 D 
B)  +3.4 D 
C)  -12.0 D 
D)  -4.3 D 
E)  +4.3 D 
A)  -3.4 D 
B)  +3.4 D 
C)  -12.0 D 
D)  -4.3 D 
E)  +4.3 D

Question 8

The image of an object, placed in front of a spherical convex mirror as shown, forms between

Accepted Answer

A)  O and V and is magnified. 
B)  V and F and is magnified. 
C)  V and F and is diminished. 
D)  F and C and is diminished. 
E)  F and C and is magnified. 
A)  O and V and is magnified. 
B)  V and F and is magnified. 
C)  V and F and is diminished. 
D)  F and C and is diminished. 
E)  F and C and is magnified.

Question 9

A ray of light is shown as it passes through a positive thin lens. If the grids are 1.0 cm apart on the figure, this lens has a focal length of

Accepted Answer

A)  18 cm 
B)  12 cm 
C)  9.0 cm 
D)  6.0 cm 
E)  3.0 cm 
A)  18 cm 
B)  12 cm 
C)  9.0 cm 
D)  6.0 cm 
E)  3.0 cm

Question 10

An object 0.50 cm high is 5.0 cm from a concave spherical mirror of focal length 20 cm. How high is the image and is it erect or inverted?

Accepted Answer

A)  0.40 cm, inverted 
B)  0.67 cm, erect 
C)  0.50 cm, inverted 
D)  0.67 cm, inverted 
E)  0.40 cm, erect 
A)  0.40 cm, inverted 
B)  0.67 cm, erect 
C)  0.50 cm, inverted 
D)  0.67 cm, inverted 
E)  0.40 cm, erect

Question 11

An object is located 7.62 com from the surface of a silvered spherical glass Christmas tree ornament that is 7.62 com in diameter. The image distance is approximately

Accepted Answer

A)  1.52 cm 
B)  -1.52 cm 
C)  4.24 cm 
D)  -4.24 cm 
E)  infinity because no image is formed. 
A)  1.52 cm 
B)  -1.52 cm 
C)  4.24 cm 
D)  -4.24 cm 
E)  infinity because no image is formed.

Question 12

An elderly person's range of vision is between 70 cm and 300 cm from the eye. What focal length lens is needed to allow her to read a newspaper clearly at the normal distance of 25 cm from her eyes?

Accepted Answer

A)  38.9 cm 
B)  18.4 cm 
C)  27.3cm 
D)  23.1 cm 
E)  70.0 cm 
A)  38.9 cm 
B)  18.4 cm 
C)  27.3cm 
D)  23.1 cm 
E)  70.0 cm

Question 13

Your eye looks into a thick glass slab at an air bubble located at point 3. The bubble appears to be at point

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 14

A real object is 42.1 cm from a negative lens that has a focal length of 25.6 cm. The object is 2.45 mm high. The height and orientation of the image are

Accepted Answer

A)  3.8 mm and inverted. 
B)  0.93 mm and erect. 
C)  6.4 mm and erect. 
D)  0.38 mm and erect. 
E)  None of these is correct. 
A)  3.8 mm and inverted. 
B)  0.93 mm and erect. 
C)  6.4 mm and erect. 
D)  0.38 mm and erect. 
E)  None of these is correct.

Question 15

The objective of a certain lens system is a double-convex lens of 10.2 cm focal length; the eyepiece is a lens of 15.2 cm focal length and is placed 25.4 cm behind the objective. When an object is 30.5 cm in front of the objective, how far is the image from the eyepiece?

Accepted Answer

A)  44.2 cm 
B)  30.5 cm 
C)  5.08 cm 
D)  22.1 cm 
E)  61.0 cm 
A)  44.2 cm 
B)  30.5 cm 
C)  5.08 cm 
D)  22.1 cm 
E)  61.0 cm

Question 16

A positive lens has a focal length f. The image is the same size as the object when

Accepted Answer

A)  the object is at the focal point. 
B)  the image is on the opposite side of the lens from the object and is the same distance from the lens as the object. 
C)  the image is on the same side of the lens as the object and is the same distance from the lens as the object. 
D)  The image can never be the same size as the object. 
E)  None of these is correct. 
A)  the object is at the focal point. 
B)  the image is on the opposite side of the lens from the object and is the same distance from the lens as the object. 
C)  the image is on the same side of the lens as the object and is the same distance from the lens as the object. 
D)  The image can never be the same size as the object. 
E)  None of these is correct.

Question 17

You have two lenses for making a compound microscope: fo = 0.800 cm and fe = 1.20 cm. How far apart should you set the the lenses to get a magnification of -300? (Assume the normal near point of 25.0 cm.)

Accepted Answer

A)  11.5 cm 
B)  12.7 cm 
C)  13.5 cm 
D)  13.9 cm 
E)  15.0 cm 
A)  11.5 cm 
B)  12.7 cm 
C)  13.5 cm 
D)  13.9 cm 
E)  15.0 cm

Question 18

The image of the object formed by the diverging lens is located at point

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 19

A double-convex lens is made of glass of refractive index 1.50. The radii of curvature of the surfaces are 10 cm and 20 cm. The focal length of this lens is

Accepted Answer

A)  4.45 cm 
B)  13.3 cm 
C)  -13.3 cm 
D)  40 cm 
E)  -40 cm 
A)  4.45 cm 
B)  13.3 cm 
C)  -13.3 cm 
D)  40 cm 
E)  -40 cm

Question 20

A concave-convex lens of flint glass has radii of 12 cm and 10 cm, respectively, and an index of refraction of 1.60. The focal length of this lens is

Accepted Answer

A)  100 cm 
B)  -100 cm 
C)  9.1 cm 
D)  -9.1 cm 
E)  14.5 cm 
A)  100 cm 
B)  -100 cm 
C)  9.1 cm 
D)  -9.1 cm 
E)  14.5 cm

Exam 12: Optical Images

Your eye looks into a thick glass slab at an air bubble located at point 3. The bubble appears to be at point

A two lens magnifying system uses lenses of focal lengths 2.5 and 9.5 cm for the objective and eyepiece respectively. The two lenses are positioned 23 cm apart. An object for study is placed 3.0 cm in front of the objective lens. Find the magnification of the final image.

An object 25 cm from a convex mirror is observed to produce an image 13.6 cm behind the mirror. What is the focal length of the mirror?

One ray is shown as it leaves an object placed before a positive lens. If this ray were continued to show its path through the lens, it would pass through point

A spherical mirror exhibits

A simple refracting telescope has an objective of focal length 75 cm and an eyepiece of focal length 3.0 cm. When viewed by the naked eye, the moon subtends an angle of about 0.009 radians. What angle is subtended by the moon when it is viewed through this telescope?

A short sighted person's range of vision is between 12 cm and 35 cm from the eye. What strength lens (in Diopters) is needed to move her near point to 25 cm?

The image of an object, placed in front of a spherical convex mirror as shown, forms between

A ray of light is shown as it passes through a positive thin lens. If the grids are 1.0 cm apart on the figure, this lens has a focal length of

An object 0.50 cm high is 5.0 cm from a concave spherical mirror of focal length 20 cm. How high is the image and is it erect or inverted?

An object is located 7.62 com from the surface of a silvered spherical glass Christmas tree ornament that is 7.62 com in diameter. The image distance is approximately

An elderly person's range of vision is between 70 cm and 300 cm from the eye. What focal length lens is needed to allow her to read a newspaper clearly at the normal distance of 25 cm from her eyes?

Your eye looks into a thick glass slab at an air bubble located at point 3. The bubble appears to be at point

A real object is 42.1 cm from a negative lens that has a focal length of 25.6 cm. The object is 2.45 mm high. The height and orientation of the image are

The objective of a certain lens system is a double-convex lens of 10.2 cm focal length; the eyepiece is a lens of 15.2 cm focal length and is placed 25.4 cm behind the objective. When an object is 30.5 cm in front of the objective, how far is the image from the eyepiece?

A positive lens has a focal length f. The image is the same size as the object when

You have two lenses for making a compound microscope: fo = 0.800 cm and fe = 1.20 cm. How far apart should you set the the lenses to get a magnification of -300? (Assume the normal near point of 25.0 cm.)

The image of the object formed by the diverging lens is located at point

A double-convex lens is made of glass of refractive index 1.50. The radii of curvature of the surfaces are 10 cm and 20 cm. The focal length of this lens is

A concave-convex lens of flint glass has radii of 12 cm and 10 cm, respectively, and an index of refraction of 1.60. The focal length of this lens is

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You have two lenses for making a compound microscope: f_o = 0.800 cm and f_e = 1.20 cm. How far apart should you set the the lenses to get a magnification of -300? (Assume the normal near point of 25.0 cm.)