Question 1

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 A

Question 2

A candle C sits between two parallel mirrors, a distance 0.2d from mirror 1.Here d is the distance between the mirrors.Multiple images of the candle appear in both mirrors.How far behind mirror 1 are the nearest three images of the candle in that mirror?

Accepted Answer

A) 0.2d, 1.8d, 2.2d 
B) 0.2d, 2.2d, 4.2d 
C) 0.2d, 1.8d, 3.8d 
D) 0.2d, 0.8d, 1.4d 
E) 0.2d, 1.8d, 3.4d 
A) 0.2d, 1.8d, 2.2d 
B) 0.2d, 2.2d, 4.2d 
C) 0.2d, 1.8d, 3.8d 
D) 0.2d, 0.8d, 1.4d 
E) 0.2d, 1.8d, 3.4d A

Question 3

An erect object is located on the central axis of a spherical mirror.The magnification is -3.This means its image is:

Accepted Answer

A) real, inverted, and on the same side of the mirror 
B) virtual, erect, and on the opposite side of the mirror 
C) real, erect, and on the same side of the mirror 
D) real, inverted, and on the opposite side of the mirror 
E) virtual, inverted, and on the opposite side of the mirror 
A) real, inverted, and on the same side of the mirror 
B) virtual, erect, and on the opposite side of the mirror 
C) real, erect, and on the same side of the mirror 
D) real, inverted, and on the opposite side of the mirror 
E) virtual, inverted, and on the opposite side of the mirror A

Question 4

The two lenses shown are illuminated by a beam of parallel light from the left.Lens B is then moved slowly toward lens A.The beam emerging from lens B is:

Accepted Answer

A) initially parallel and then diverging 
B) always diverging 
C) initially converging and finally parallel 
D) always parallel 
E) initially converging and finally diverging 
A) initially parallel and then diverging 
B) always diverging 
C) initially converging and finally parallel 
D) always parallel 
E) initially converging and finally diverging

Question 5

In a cinema, a picture 2.5 cm wide on the film is projected to an image 3.0 m wide on a screen which is 18 m away.The focal length of the lens is about:

Accepted Answer

A) 7.5 cm 
B) 10 cm 
C) 12.5 cm 
D) 15 cm 
E) 20 cm 
A) 7.5 cm 
B) 10 cm 
C) 12.5 cm 
D) 15 cm 
E) 20 cm

Question 6

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 7

A concave spherical surface with radius r separates a medium with index of refraction 2 from air.As an object in air is moved toward the surface from far away along the central axis, its image:

Accepted Answer

A) changes from virtual to real when it is a distance r/2 from the surface 
B) changes from virtual to real when it is a distance 2r from the surface 
C) changes from real to virtual when it is a distance r/2 from the surface 
D) changes from real to virtual when it is a distance 2r from the surface 
E) remains virtual 
A) changes from virtual to real when it is a distance r/2 from the surface 
B) changes from virtual to real when it is a distance 2r from the surface 
C) changes from real to virtual when it is a distance r/2 from the surface 
D) changes from real to virtual when it is a distance 2r from the surface 
E) remains virtual

Question 8

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 9

As an object is moved from the center of curvature of a concave mirror toward its focal point its image:

Accepted Answer

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

Question 10

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

Question 11

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 12

Let p denote the object-lens distance and i the image-lens distance.The image produced by a lens of focal length f has a height that can be obtained from the object height by multiplying it by:

Accepted Answer

A) p/i 
B) i/p 
C) f/p 
D) f/i 
E) i/f 
A) p/i 
B) i/p 
C) f/p 
D) f/i 
E) i/f

Question 13

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

Question 14

A convex refracting surface has a radius of 12 cm.Light is incident in air (n = 1)and refracted into a medium with an index of refraction of 2.To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis:

Accepted Answer

A) 3 cm from the surface 
B) 6 cm from the surface 
C) 12 cm from the surface 
D) 18 cm from the surface 
E) 24 cm from the surface 
A) 3 cm from the surface 
B) 6 cm from the surface 
C) 12 cm from the surface 
D) 18 cm from the surface 
E) 24 cm from the surface

Question 15

A concave mirror forms a real image which is twice the size of the object.If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

Accepted Answer

A) 13 cm 
B) 20 cm 
C) 27 cm 
D) 40 cm 
E) 80 cm 
A) 13 cm 
B) 20 cm 
C) 27 cm 
D) 40 cm 
E) 80 cm

Question 16

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

Accepted Answer

A) 4 cm behind the mirror 
B) 4 cm in front of the mirror 
C) 12 cm behind the mirror 
D) 12 cm in front of the mirror 
E) at infinity 
A) 4 cm behind the mirror 
B) 4 cm in front of the mirror 
C) 12 cm behind the mirror 
D) 12 cm in front of the mirror 
E) at infinity

Question 17

A ball is held 50 cm in front of a plane mirror.The distance between the ball and its image is:

Accepted Answer

A) 0 cm 
B) 50 cm 
C) 100 cm 
D) 150 cm 
E) 200 cm 
A) 0 cm 
B) 50 cm 
C) 100 cm 
D) 150 cm 
E) 200 cm

Question 18

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 19

The image produced by a convex mirror of an erect object in front of the mirror is always:

Accepted Answer

A) virtual, erect, and larger than the object 
B) virtual, erect, and smaller than the object 
C) real, erect, and larger than the object 
D) real, erect, and smaller than the object 
E) none of the above 
A) virtual, erect, and larger than the object 
B) virtual, erect, and smaller than the object 
C) real, erect, and larger than the object 
D) real, erect, and smaller than the object 
E) none of the above

Question 20

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

Exam 34: Images

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

A candle C sits between two parallel mirrors, a distance 0.2d from mirror 1.Here d is the distance between the mirrors.Multiple images of the candle appear in both mirrors.How far behind mirror 1 are the nearest three images of the candle in that mirror?

An erect object is located on the central axis of a spherical mirror.The magnification is -3.This means its image is:

The two lenses shown are illuminated by a beam of parallel light from the left.Lens B is then moved slowly toward lens A.The beam emerging from lens B is:

In a cinema, a picture 2.5 cm wide on the film is projected to an image 3.0 m wide on a screen which is 18 m away.The focal length of the lens is about:

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 concave spherical surface with radius r separates a medium with index of refraction 2 from air.As an object in air is moved toward the surface from far away along the central axis, its image:

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:

As an object is moved from the center of curvature of a concave mirror toward its focal point its image:

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:

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:

Let p denote the object-lens distance and i the image-lens distance.The image produced by a lens of focal length f has a height that can be obtained from the object height by multiplying it by:

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

A convex refracting surface has a radius of 12 cm.Light is incident in air (n = 1)and refracted into a medium with an index of refraction of 2.To obtain light with rays parallel to the central axis after refraction a point source should be placed on the axis:

A concave mirror forms a real image which is twice the size of the object.If the object is 20 cm from the mirror, the radius of curvature of the mirror must be about:

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

A ball is held 50 cm in front of a plane mirror.The distance between the ball and 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:

The image produced by a convex mirror of an erect object in front of the mirror is always:

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

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves I

Waves II

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters