Question 1

Ellen places an object 48.4 cm from a concave lens.If a virtual image appears 24.6 cm from the lens on the same side as the object,what is the focal length of the lens?

Accepted Answer

A) -16.3 cm 
B) -50.0 cm 
C) 732 cm 
D) -23.8 cm 
E) -36.5 cm 
A) -16.3 cm 
B) -50.0 cm 
C) 732 cm 
D) -23.8 cm 
E) -36.5 cm

Question 2

When light goes through two or more separated lenses,

Accepted Answer

A) the image distance of the first lens (the one nearest the object)will be positive. 
B) the final image can be inverted. 
C) the image distance of the first lens will be the object distance for the second lens. 
D) the object distance for the second lens will be negative. 
A) the image distance of the first lens (the one nearest the object)will be positive. 
B) the final image can be inverted. 
C) the image distance of the first lens will be the object distance for the second lens. 
D) the object distance for the second lens will be negative.

Question 3

An object and a screen are separated by 15.0 cm.A convex lens is placed between them,6.82 cm from the object.In this position it causes a sharp image of the object to form on the screen.What is the focal length of the lens?

Accepted Answer

A) 4.69 cm 
B) 41.0 cm 
C) 3.72 cm 
D) 12.5 cm 
E) 4.09 cm 
A) 4.69 cm 
B) 41.0 cm 
C) 3.72 cm 
D) 12.5 cm 
E) 4.09 cm

Question 4

Which of the following best describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance?

Accepted Answer

A) virtual,upright and magnification greater than one 
B) real,inverted and magnification less than one 
C) virtual,upright and magnification less than one 
D) real,inverted and magnification greater than one 
A) virtual,upright and magnification greater than one 
B) real,inverted and magnification less than one 
C) virtual,upright and magnification less than one 
D) real,inverted and magnification greater than one

Question 5

A real object is place to the left of a converging lens and an image forms.Then,to the right of the converging lens a diverging lens is placed.A real,inverted final image forms to the right of the diverging lens.Which of the following could give this result?

Accepted Answer

A) An upright virtual image caused by the first lens forms between the two lenses. 
B) An inverted real image caused by the first lens forms between the two lenses. 
C) A real,upright image was formed by the first lens to the right of where the diverging lens is to be placed. 
D) A real,inverted image was formed by the first lens to the right of where the diverging lens is to be placed. 
A) An upright virtual image caused by the first lens forms between the two lenses. 
B) An inverted real image caused by the first lens forms between the two lenses. 
C) A real,upright image was formed by the first lens to the right of where the diverging lens is to be placed. 
D) A real,inverted image was formed by the first lens to the right of where the diverging lens is to be placed.

Question 6

A projector lens is needed to form an image on a screen 6 times the size of its corresponding object.The screen is located 8.65 m from the lens.What is the required focal length of the lens?

Accepted Answer

A) 1.44 m 
B) 7.41 m 
C) 1.24 m 
D) 0.721 m 
E) 1.73 m 
A) 1.44 m 
B) 7.41 m 
C) 1.24 m 
D) 0.721 m 
E) 1.73 m

Question 7

A container is filled with fluid 1,and the apparent depth of the fluid is 9.00 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 6.86 cm.If the index of refraction of the first fluid is 1.37,what is the index of refraction of the second fluid?

Accepted Answer

A) 1.80 
B) 2.41 
C) 1.57 
D) 1.20 
E) More information is needed to find the value. 
A) 1.80 
B) 2.41 
C) 1.57 
D) 1.20 
E) More information is needed to find the value.

Question 8

Two thin lenses with 6.80-cm focal lengths at are mounted at opposite ends of a 18.8-cm long tube.An object is located 20.4 cm from one end of the tube.How far from the opposite end is the final image?

Accepted Answer

A) 8.88 cm 
B) 32.5 cm 
C) 4.54 cm 
D) 8.60 cm 
E) 20.4 cm 
A) 8.88 cm 
B) 32.5 cm 
C) 4.54 cm 
D) 8.60 cm 
E) 20.4 cm

Question 9

A lens has a focal length of 56.2 cm in air.If this lens were immersed in water,what focal length would result? The index of refraction of the lens is 1.96 and that of water is 1.333.The focal length of a thin lens with index n1 submerged in a liquid with index n2 is given by the modified lens-maker's formula:  
)

Accepted Answer

A) 115 cm 
B) 27.5 cm 
C) 169 cm 
D) 82.6 cm 
E) 61.0 cm 
A) 115 cm 
B) 27.5 cm 
C) 169 cm 
D) 82.6 cm 
E) 61.0 cm

Question 10

Ansel places an object 34.8 cm from a thin convex lens along the axis.If a real image forms at a distance of 13.2 cm from the lens,what is the focal length of the lens?

Accepted Answer

A) 34.8 cm 
B) 21.3 cm 
C) 13.2 cm 
D) 9.57 cm 
E) 21.6 cm 
A) 34.8 cm 
B) 21.3 cm 
C) 13.2 cm 
D) 9.57 cm 
E) 21.6 cm

Question 11

Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?

Accepted Answer

A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering 
A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering

Question 12

When the reflection of an object is seen in a plane mirror,the distance from the mirror to the image depends on

Accepted Answer

A) the wavelength of light used for viewing. 
B) the distance from the object to the mirror. 
C) the distance of both the observer and the object to the mirror. 
D) the size of the object. 
A) the wavelength of light used for viewing. 
B) the distance from the object to the mirror. 
C) the distance of both the observer and the object to the mirror. 
D) the size of the object.

Question 13

A convex mirror with a focal length of -28.0 cm forms an image 11.3 cm behind the surface.If the object height is 2.00 cm what is the image height?

Accepted Answer

A) 1.19 cm 
B) 3.35 cm 
C) 1.35 cm 
D) 2.00 cm 
E) 0.807 cm 
A) 1.19 cm 
B) 3.35 cm 
C) 1.35 cm 
D) 2.00 cm 
E) 0.807 cm

Question 14

For a converging lens with two curved surfaces,the radius of curvature for both surfaces is 13.1 cm.If the focal length is 16.5 cm,what must the index of refraction be?

Accepted Answer

A) 1.40 
B) 1.79 
C) 1.52 
D) 1.56 
E) 1.63 
A) 1.40 
B) 1.79 
C) 1.52 
D) 1.56 
E) 1.63

Question 15

A thin lens has a focal length of 10.00 cm for red light.If the index of refraction for the lens material tends to decrease with increasing wavelength,what is the focal length of the lens for blue light?

Accepted Answer

A) also 10.00 cm 
B) less that 10.00 cm 
C) more than 10.00 cm 
D) It depends on whether the lens is converging or diverging. 
A) also 10.00 cm 
B) less that 10.00 cm 
C) more than 10.00 cm 
D) It depends on whether the lens is converging or diverging.

Question 16

Use of a parabolic mirror,instead of one made of a circular arc surface,can be used to reduce the occurrence of which of the following effects?

Accepted Answer

A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering 
A) spherical aberration 
B) mirages 
C) chromatic aberration 
D) light scattering

Question 17

A woman looking in a makeup mirror sees her face at twice its actual size and right-side up.If she is 21.0 cm from the mirror,what is its focal length?

Accepted Answer

A) 14.0 cm 
B) 42.0 cm 
C) 10.5 cm 
D) 42.0 cm. 
E) 21.0 cm 
A) 14.0 cm 
B) 42.0 cm 
C) 10.5 cm 
D) 42.0 cm. 
E) 21.0 cm

Question 18

A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector.What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?

Accepted Answer

A) 90° 
B) 180° 
C) 0° 
D) 360° 
A) 90° 
B) 180° 
C) 0° 
D) 360°

Exam 23: Mirrors and Lenses

Ellen places an object 48.4 cm from a concave lens.If a virtual image appears 24.6 cm from the lens on the same side as the object,what is the focal length of the lens?

When light goes through two or more separated lenses,

An object and a screen are separated by 15.0 cm.A convex lens is placed between them,6.82 cm from the object.In this position it causes a sharp image of the object to form on the screen.What is the focal length of the lens?

Which of the following best describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance?

A real object is place to the left of a converging lens and an image forms.Then,to the right of the converging lens a diverging lens is placed.A real,inverted final image forms to the right of the diverging lens.Which of the following could give this result?

A projector lens is needed to form an image on a screen 6 times the size of its corresponding object.The screen is located 8.65 m from the lens.What is the required focal length of the lens?

A container is filled with fluid 1,and the apparent depth of the fluid is 9.00 cm.The container is next filled with fluid 2,and the apparent depth of this fluid is 6.86 cm.If the index of refraction of the first fluid is 1.37,what is the index of refraction of the second fluid?

Two thin lenses with 6.80-cm focal lengths at are mounted at opposite ends of a 18.8-cm long tube.An object is located 20.4 cm from one end of the tube.How far from the opposite end is the final image?

Ansel places an object 34.8 cm from a thin convex lens along the axis.If a real image forms at a distance of 13.2 cm from the lens,what is the focal length of the lens?

Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?

When the reflection of an object is seen in a plane mirror,the distance from the mirror to the image depends on

A convex mirror with a focal length of -28.0 cm forms an image 11.3 cm behind the surface.If the object height is 2.00 cm what is the image height?

For a converging lens with two curved surfaces,the radius of curvature for both surfaces is 13.1 cm.If the focal length is 16.5 cm,what must the index of refraction be?

A thin lens has a focal length of 10.00 cm for red light.If the index of refraction for the lens material tends to decrease with increasing wavelength,what is the focal length of the lens for blue light?

Use of a parabolic mirror,instead of one made of a circular arc surface,can be used to reduce the occurrence of which of the following effects?

A woman looking in a makeup mirror sees her face at twice its actual size and right-side up.If she is 21.0 cm from the mirror,what is its focal length?

A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector.What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?

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