Question 1

Two plane mirrors make an angle of 120° with each other.The maximum number of images of an object placed between them is:

Accepted Answer

A) one 
B) two 
C) three 
D) four 
E) more than four 
A) one 
B) two 
C) three 
D) four 
E) more than four B

Question 2

The figure shows a concave mirror with a small object located at the point marked 6.If the image is also at this point, then the center of curvature of the mirror is at the point marked:

Accepted Answer

A) 3 
B) 4 
C) 6 
D) 9 
E) 12 
A) 3 
B) 4 
C) 6 
D) 9 
E) 12 C

Question 3

An erect object is located between a concave mirror and its focal point.Its image is:

Accepted Answer

A) real, erect, and larger than the object 
B) real, inverted, and larger than the object 
C) virtual, erect, and larger than the object 
D) virtual, inverted, and larger than the object 
E) virtual, erect, and smaller than the object 
A) real, erect, and larger than the object 
B) real, inverted, and larger than the object 
C) virtual, erect, and larger than the object 
D) virtual, inverted, and larger than the object 
E) virtual, erect, and smaller than the object C

Question 4

A plane mirror is in a vertical plane and is rotating about a vertical axis at 100 rpm.A horizontal beam of light is incident on the mirror.The reflected beam will rotate at:

Accepted Answer

A) 0 rpm 
B) 100 rpm 
C) 141 rpm 
D) 200 rpm 
E) 10,000 rpm 
A) 0 rpm 
B) 100 rpm 
C) 141 rpm 
D) 200 rpm 
E) 10,000 rpm

Question 5

An object is 20 cm to the left of a lens of focal length +10 cm.A second lens, of focal length +12.5 cm, is 30 cm to the right of the first lens.The distance between the original object and the final image is:

Accepted Answer

A) 0 cm 
B) 28 cm 
C) 50 cm 
D) 100 cm 
E) infinite 
A) 0 cm 
B) 28 cm 
C) 50 cm 
D) 100 cm 
E) infinite

Question 6

An object is in front of a converging lens, at a distance less than the focal length from the lens.Its image is:

Accepted Answer

A) virtual and larger than the object 
B) real and smaller than the object 
C) virtual and smaller than the object 
D) real and larger than the object 
E) virtual and the same size as the object 
A) virtual and larger than the object 
B) real and smaller than the object 
C) virtual and smaller than the object 
D) real and larger than the object 
E) virtual and the same size as the object

Question 7

Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope.In ordinary use, the object:

Accepted Answer

A) is less than fo from the objective lens 
B) is more that fo from the objective 
C) produces an intermediate image which is slightly more than fe from the eyepiece 
D) produces an intermediate image which is 2fe away from the eyepiece 
E) produces an intermediate image which is less than fo from the objective 
A) is less than fo from the objective lens 
B) is more that fo from the objective 
C) produces an intermediate image which is slightly more than fe from the eyepiece 
D) produces an intermediate image which is 2fe away from the eyepiece 
E) produces an intermediate image which is less than fo from the objective

Question 8

A converging lens of focal length 20 cm is placed in contact with a diverging lens of focal length 30 cm.The focal length of this combination is:

Accepted Answer

A) +60 cm 
B) +25 cm 
C) +12 cm 
D) +10 cm 
E) -10 cm 
A) +60 cm 
B) +25 cm 
C) +12 cm 
D) +10 cm 
E) -10 cm

Question 9

A magnifying glass has a focal length of 15 cm.If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

Accepted Answer

A) 0.067 
B) 0.33 
C) 0.5 
D) 0.67 
E) 1.7 
A) 0.067 
B) 0.33 
C) 0.5 
D) 0.67 
E) 1.7

Question 10

An object is 2 m in front of a plane mirror.Its image is:

Accepted Answer

A) virtual, inverted, and 2 m behind the mirror 
B) virtual, inverted, and 2 m in front of the mirror 
C) virtual, erect, and 2 m in front of the mirror 
D) real, erect, and 2 m behind the mirror 
E) none of the above 
A) virtual, inverted, and 2 m behind the mirror 
B) virtual, inverted, and 2 m in front of the mirror 
C) virtual, erect, and 2 m in front of the mirror 
D) real, erect, and 2 m behind the mirror 
E) none of the above

Question 11

The passenger-side rear view mirror on a car says, "Objects in the mirror may be closer than they appear".Assuming the images are not inverted, this mirror must be:

Accepted Answer

A) concave 
B) plane 
C) convex 
D) mounted on the wrong side of the car 
E) confused, as objects cannot be closer than they appear 
A) concave 
B) plane 
C) convex 
D) mounted on the wrong side of the car 
E) confused, as objects cannot be closer than they appear

Question 12

Consider the following four statements concerning a compound microscope:   Which two of the four statements are correct?

Accepted Answer

A) I, II 
B) I, III 
C) I, IV 
D) II, III 
E) II, IV 
A) I, II 
B) I, III 
C) I, IV 
D) II, III 
E) II, IV

Question 13

An object is 30 cm in front of a converging lens of focal length 10 cm.The image is:

Accepted Answer

A) real and larger than the object 
B) real and the same size than the object 
C) real and smaller than the object 
D) virtual and the same size than the object 
E) virtual and smaller than the object 
A) real and larger than the object 
B) real and the same size than the object 
C) real and smaller than the object 
D) virtual and the same size than the object 
E) virtual and smaller than the object

Question 14

Roadway mirages are formed when:

Accepted Answer

A) the warm air above the hood of your car bends light from the sky, making the road appear wet 
B) a layer of cold air above the road bends light from the sky, making it look like there is a puddle on the road 
C) a layer of warm air above the road bends light from the sky, making it look like there is a puddle on the road 
D) a layer of cold air above the road bends light from the road so it looks wet when it is actually dry 
E) a layer of warm air above the road bends light from the road so it looks wet when it is actually dry 
A) the warm air above the hood of your car bends light from the sky, making the road appear wet 
B) a layer of cold air above the road bends light from the sky, making it look like there is a puddle on the road 
C) a layer of warm air above the road bends light from the sky, making it look like there is a puddle on the road 
D) a layer of cold air above the road bends light from the road so it looks wet when it is actually dry 
E) a layer of warm air above the road bends light from the road so it looks wet when it is actually dry

Question 15

A 3-cm high object is in front of a thin lens.The object distance is 4 cm and the image distance is -8 cm.The image height is:

Accepted Answer

A) 0.5 cm 
B) 1 cm 
C) 1.5 cm 
D) 6 cm 
E) 24 cm 
A) 0.5 cm 
B) 1 cm 
C) 1.5 cm 
D) 6 cm 
E) 24 cm

Question 16

A concave spherical mirror has a focal length of 12 cm.If an erect object is placed 6 cm in front of it:

Accepted Answer

A) the magnification is 2 and the image is erect 
B) the magnification is 2 and the image is inverted 
C) the magnification is 0.67 and the image is erect 
D) the magnification is 0.67 and the image is inverted 
E) the magnification is 0.5 and the image is erect 
A) the magnification is 2 and the image is erect 
B) the magnification is 2 and the image is inverted 
C) the magnification is 0.67 and the image is erect 
D) the magnification is 0.67 and the image is inverted 
E) the magnification is 0.5 and the image is erect

Question 17

Two thin lenses (focal lengths f1 and f2)are in contact.Their equivalent focal length is:

Accepted Answer

A) f1 + f2 
B) f1f2/(f1 + f2) 
C) 1/f1 + 1/f2 
D) f1 - f2 
E) f1(f1 - f2)/f2 
A) f1 + f2 
B) f1f2/(f1 + f2) 
C) 1/f1 + 1/f2 
D) f1 - f2 
E) f1(f1 - f2)/f2

Question 18

A parallel beam of monochromatic light in air is incident on a plane glass surface.In the glass, the beam:

Accepted Answer

A) remains parallel 
B) undergoes dispersion 
C) becomes diverging 
D) follows a parabolic path 
E) becomes converging 
A) remains parallel 
B) undergoes dispersion 
C) becomes diverging 
D) follows a parabolic path 
E) becomes converging

Question 19

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size?

Accepted Answer

A) one focal length 
B) half the focal length 
C) twice the focal length 
D) less than half the focal length 
E) more than twice the focal length 
A) one focal length 
B) half the focal length 
C) twice the focal length 
D) less than half the focal length 
E) more than twice the focal length

Question 20

If the image distance is negative,

Accepted Answer

A) the image is real. 
B) the image is virtual. 
C) the mirror is concave. 
D) you have made a mistake; image distances must be positive. 
E) the object distance must also be negative. 
A) the image is real. 
B) the image is virtual. 
C) the mirror is concave. 
D) you have made a mistake; image distances must be positive. 
E) the object distance must also be negative.

Exam 34: Images

Two plane mirrors make an angle of 120° with each other.The maximum number of images of an object placed between them is:

The figure shows a concave mirror with a small object located at the point marked 6.If the image is also at this point, then the center of curvature of the mirror is at the point marked:

An erect object is located between a concave mirror and its focal point.Its image is:

A plane mirror is in a vertical plane and is rotating about a vertical axis at 100 rpm.A horizontal beam of light is incident on the mirror.The reflected beam will rotate at:

An object is 20 cm to the left of a lens of focal length +10 cm.A second lens, of focal length +12.5 cm, is 30 cm to the right of the first lens.The distance between the original object and the final image is:

An object is in front of a converging lens, at a distance less than the focal length from the lens.Its image is:

Let fo and fe be the focal lengths of the objective and eyepiece of a compound microscope.In ordinary use, the object:

A converging lens of focal length 20 cm is placed in contact with a diverging lens of focal length 30 cm.The focal length of this combination is:

A magnifying glass has a focal length of 15 cm.If the near point of the eye is 25 cm from the eye the angular magnification of the glass is about:

An object is 2 m in front of a plane mirror.Its image is:

The passenger-side rear view mirror on a car says, "Objects in the mirror may be closer than they appear".Assuming the images are not inverted, this mirror must be:

Consider the following four statements concerning a compound microscope: Which two of the four statements are correct?

An object is 30 cm in front of a converging lens of focal length 10 cm.The image is:

Roadway mirages are formed when:

A 3-cm high object is in front of a thin lens.The object distance is 4 cm and the image distance is -8 cm.The image height is:

A concave spherical mirror has a focal length of 12 cm.If an erect object is placed 6 cm in front of it:

Two thin lenses (focal lengths f1 and f2)are in contact.Their equivalent focal length is:

A parallel beam of monochromatic light in air is incident on a plane glass surface.In the glass, the beam:

At what distance in front of a concave mirror must an object be placed so that the image and object are the same size?

If the image distance is negative,

Measurement

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

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Filters

Let f_o and f_e be the focal lengths of the objective and eyepiece of a compound microscope.In ordinary use, the object:

Two thin lenses (focal lengths f₁ and f₂)are in contact.Their equivalent focal length is: