Question 1

An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm.If the object is 4.0 cm tall,how tall is the image?

Accepted Answer

A) 1.0 cm 
B) 2.0 cm 
C) 8.0 cm 
D) 16 cm 
A) 1.0 cm 
B) 2.0 cm 
C) 8.0 cm 
D) 16 cm

Question 2

Nearsightedness is usually corrected with

Accepted Answer

A) convex lenses. 
B) concave lenses. 
C) convex mirrors. 
D) cylindrical lenses. 
E) concave mirrors. 
A) convex lenses. 
B) concave lenses. 
C) convex mirrors. 
D) cylindrical lenses. 
E) concave mirrors.

Question 3

If the back of a person's eye is too close to the lens,this person is suffering from

Accepted Answer

A) nearsightedness. 
B) spherical aberration. 
C) astigmatism. 
D) chromatic aberration. 
E) farsightedness. 
A) nearsightedness. 
B) spherical aberration. 
C) astigmatism. 
D) chromatic aberration. 
E) farsightedness.

Question 4

A convex lens has focal length f.If an object is placed at a distance between f and 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) that is greater than 2f. 
E) of infinity. 
A) of 2f. 
B) between f and 2f. 
C) of f. 
D) that is greater than 2f. 
E) of infinity.

Question 5

When a person stands 40 cm in front of a cosmetic (concave)spherical mirror,the upright image is twice the size of the object.What is the focal length of the mirror?

Accepted Answer

A) 27 cm 
B) 40 cm 
C) 80 cm 
D) 160 cm 
A) 27 cm 
B) 40 cm 
C) 80 cm 
D) 160 cm

Question 6

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm.It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm.A blood sample is placed 1.50 mm from the objective.The magnitude of the overall magnification is closest to

Accepted Answer

A) 18. 
B) 37. 
C) 180. 
D) 370. 
A) 18. 
B) 37. 
C) 180. 
D) 370.

Question 7

Reza's face is 20 cm in front of a concave shaving mirror having a focal length of magnitude 30 cm.How large is the image of his face?

Accepted Answer

A) half as large as his face 
B) of the same size as his face 
C) twice as large as his face 
D) three times as large as his face 
E) four times as large as his face 
A) half as large as his face 
B) of the same size as his face 
C) twice as large as his face 
D) three times as large as his face 
E) four times as large as his face

Question 8

A convex mirror has a focal length of magnitude f.An object is placed in front of this mirror at a point $\frac { 2 } { 3 }$ f from the face of the mirror.The image will appear

Accepted Answer

A) behind the mirror. 
B) upright and reduced. 
C) upright and enlarged. 
D) inverted and reduced. 
E) inverted and enlarged. 
A) behind the mirror. 
B) upright and reduced. 
C) upright and enlarged. 
D) inverted and reduced. 
E) inverted and enlarged.

Question 9

What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?

Accepted Answer

A) -100 cm 
B) -31.3 cm 
C) 10.2 cm 
D) 20.8 cm 
E) 31.3 cm 
A) -100 cm 
B) -31.3 cm 
C) 10.2 cm 
D) 20.8 cm 
E) 31.3 cm

Question 10

A person's near point is 25 cm,and her eye lens is 2.7 cm away from the retina.What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?

Accepted Answer

A) -3.4 cm 
B) -2.4 cm 
C) 2.4 cm 
D) 3.4 cm 
E) 2.6 cm 
A) -3.4 cm 
B) -2.4 cm 
C) 2.4 cm 
D) 3.4 cm 
E) 2.6 cm

Question 11

The objective lens of a microscope has a focal length of 2.4 mm and the eyepiece has an angular magnification of 15.The object is positioned 0.060 mm beyond the focal point of the objective.The focal point of the eyepiece is positioned at the real image formed by the objective.The near point of the microscope user is at 25 cm.The magnitude of the overall magnification of the microscope is closest to

Accepted Answer

A) 400. 
B) 450. 
C) 500. 
D) 550. 
E) 600. 
A) 400. 
B) 450. 
C) 500. 
D) 550. 
E) 600.

Question 12

A student constructs an astronomical telescope with a magnification of 10.If the telescope has an objective lens of focal length 0.50 m,what is the resulting length of the telescope?

Accepted Answer

A) 53 cm 
B) 55 cm 
C) 60 cm 
D) 75 cm 
A) 53 cm 
B) 55 cm 
C) 60 cm 
D) 75 cm

Question 13

David stands 2.5 m in front of a plane mirror.
(a)How far from David is his image in the mirror?
(b)If David moves away from the mirror at 1.5 m/s,how fast are David and his image moving apart from each other?
(c)If David is 180 cm tall,how tall is his image in the mirror?

Accepted Answer

(a)5.0 cm

Question 14

An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror.How far is the object from the mirror?

Accepted Answer

A) 124 cm 
B) 47.6 cm 
C) 18.2 cm 
D) 12.0 cm 
A) 124 cm 
B) 47.6 cm 
C) 18.2 cm 
D) 12.0 cm

Question 15

A lab specimen is 15.2 mm from a convex lens.The image is 4.0 mm tall and 9.0 cm from the lens.How tall is the specimen?

Accepted Answer

A) 6.8 mm 
B) 5.4 mm 
C) 1.7 mm 
D) 0.68 mm 
A) 6.8 mm 
B) 5.4 mm 
C) 1.7 mm 
D) 0.68 mm

Question 16

The focal length of a concave mirror has a magnitude of 20 cm.What is its radius of curvature?

Accepted Answer

A) 10 cm 
B) 40 cm 
C) -40 cm 
D) 20 cm 
E) -20 cm 
A) 10 cm 
B) 40 cm 
C) -40 cm 
D) 20 cm 
E) -20 cm

Question 17

A drawing is placed 40 cm in front of a thin lens.If a virtual image forms at a distance of 50 cm from the lens,on the same side as the drawing,what is the focal length of the lens?

Accepted Answer

A) -45 cm 
B) 75 cm 
C) 90 cm 
D) 200 cm 
E) +45 cm 
A) -45 cm 
B) 75 cm 
C) 90 cm 
D) 200 cm 
E) +45 cm

Question 18

A person having a near point of 25 cm uses a magnifying glass with a focal length of 10 cm.What is the angular magnification of the glass for that person when her eyes are focused at infinity?

Accepted Answer

A) 1.5 
B) 2.5 
C) 3.5 
D) 4.5 
A) 1.5 
B) 2.5 
C) 3.5 
D) 4.5

Question 19

Jack and Mary view the same microorganism through the same compound microscope.Mary's near point distance,NM,is twice as large as Jack's near point distance,NJ.If Mary sees the microorganism with magnification MM,with what magnification does Jack see it?

Accepted Answer

A) 2 MM 
B) MM/2 
C) 4 MM 
D) MM/4 
E) 8 MM 
A) 2 MM 
B) MM/2 
C) 4 MM 
D) MM/4 
E) 8 MM

Question 20

An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm.What is the magnification?

Accepted Answer

A) -0.54 
B) 0.54 
C) -0.32 
D) -0.22 
E) 0.22 
A) -0.54 
B) 0.54 
C) -0.32 
D) -0.22 
E) 0.22

Exam 23: Mirrors and Lenses

An object is placed 15 cm from a spherical concave mirror with a focal length of magnitude 20 cm.If the object is 4.0 cm tall,how tall is the image?

Nearsightedness is usually corrected with

If the back of a person's eye is too close to the lens,this person is suffering from

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

When a person stands 40 cm in front of a cosmetic (concave)spherical mirror,the upright image is twice the size of the object.What is the focal length of the mirror?

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm.It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm.A blood sample is placed 1.50 mm from the objective.The magnitude of the overall magnification is closest to

Reza's face is 20 cm in front of a concave shaving mirror having a focal length of magnitude 30 cm.How large is the image of his face?

A convex mirror has a focal length of magnitude f.An object is placed in front of this mirror at a point 23\frac { 2 } { 3 }32​ f from the face of the mirror.The image will appear

What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?

A person's near point is 25 cm,and her eye lens is 2.7 cm away from the retina.What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?

A student constructs an astronomical telescope with a magnification of 10.If the telescope has an objective lens of focal length 0.50 m,what is the resulting length of the telescope?

David stands 2.5 m in front of a plane mirror. (a)How far from David is his image in the mirror? (b)If David moves away from the mirror at 1.5 m/s,how fast are David and his image moving apart from each other? (c)If David is 180 cm tall,how tall is his image in the mirror?

An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror.How far is the object from the mirror?

A lab specimen is 15.2 mm from a convex lens.The image is 4.0 mm tall and 9.0 cm from the lens.How tall is the specimen?

The focal length of a concave mirror has a magnitude of 20 cm.What is its radius of curvature?

A drawing is placed 40 cm in front of a thin lens.If a virtual image forms at a distance of 50 cm from the lens,on the same side as the drawing,what is the focal length of the lens?

A person having a near point of 25 cm uses a magnifying glass with a focal length of 10 cm.What is the angular magnification of the glass for that person when her eyes are focused at infinity?

Jack and Mary view the same microorganism through the same compound microscope.Mary's near point distance,NM,is twice as large as Jack's near point distance,NJ.If Mary sees the microorganism with magnification MM,with what magnification does Jack see it?

An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm.What is the magnification?

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Magnetism

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

A convex mirror has a focal length of magnitude f.An object is placed in front of this mirror at a point $\frac { 2 } { 3 }$ f from the face of the mirror.The image will appear

Jack and Mary view the same microorganism through the same compound microscope.Mary's near point distance,N_M,is twice as large as Jack's near point distance,N_J.If Mary sees the microorganism with magnification M_M,with what magnification does Jack see it?