Spherical Mirrors

How far in front of a concave mirror of focal length 10 cm, would you place a 2cm pin in order to obtain an erect image 4 cm in height?
1. 15 cm
2. 10 cm
3. 5 cm
4. 30 cm
5. 25 cm
A student wishes t obtain an upright two-fold magnification of her face in a concave mirror of focal length 30 cm.
At what distance in front of the mirror should she place your face?
1. 45 cm
2. 15 cm
3. 30 cm
4. 10 cm
5. 20 cm
When a small object is placed on the principal axis of a concave mirror between the focus and the mirror, the image formed is
1. erect, magnified and virtual
2. erect, diminished and real
3. inverted, diminished and real
4. inverted, magnified and real
5. inverted, diminished and virtual
Which one of the following statements regarding a convex mirror is incorrect?
1. It always gives a real image
2. It always gives a diminished image
3. It always gives an erect image
4. It gives a wide field of view
When a small object is placed on the principle axis of a convex mirror, the image formed is
1. erect, diminished and virtual
2. erect, magnified and virtual
3. inverted, magnified and real
4. inverted, diminished and real
5. erect, magnified and real
When an object is held very close to a concave mirror the image is
1. larger and upright
2. smaller and inverted
3. larger and inverted
4. smaller and upright
5. the same size and upright
The focal tength of a spherical mirror is approximately equal to
1. half the radius of curvature
2. quarter the radius of curvature
3. the radius of curvature
4. twice the radius of curvature
5. four times the radius of curvature
The focal length of a spherical mirror is equal to
A concave mirror forms a virtual image of a real object when the object is
1. inside the focus
2. outside the centre of curtvature
3. at the centre of curvature
4. at the focus
5. between the centre of curvature and the focus
An object is placed at a distance of 2f from a concave mirror of focal length f.
The magnification of the image is
1. 1
2. ½
3. 2
4. 1½
Which one of the following is incorrect?
A concave mirror may form an image which is
1. real, erect and magnified
2. real, inverted and diminished
3. virtual, erect and magnified
4. real, inverted and same size
5. real, inverted and magnified
The image in a convex mirror is always
1. virtual, erect and diminished
2. virtual, inverted and diminished
3. virtual, erect and magnified
4. real, erect and magnified
5. real, erect and diminished
A convex mirror produces a virtual image when the object is
1. anywhere in front of the mirror
2. outside the centre of curvature
3. between the centre of curvature and the focus
4. at the focus
5. inside the focus
An object is placed at a distance of 2f from a concave mirror of focal length f.
The image distance is
1. 2f
2. f
3. 3f
4. 3f/2
Concave mirrors are used as rear view mirrors in cars because (i) they have a wide field of view (ii) the image is always virtual (iii) the image is always diminished (iv) the image is always erect
Which of these reasons is/are correct?
1. (i) and (iv)
2. (ii) and (iv)
3. (i) and (ii)
4. (i) and (iii)
5. (ii) and (iii)
Which one of the following statements is true for convex mirrors?
1. They have a wide field of view.
2. They always give a real, erect, diminished image.
3. They can produce a parallel beam of light.
4. They always give a virtual, erect, magnified image.
Which one of the following statements is true for concave mirrors?
1. They can concentrate the Sun's rays to produce intense heat ata spot.
2. They always produce real images.
3. They always produce magnified images.
4. They always produce virtual images.
A student using a concave mirror, locates an inverted image, the same size and at the same position as the object.
Which one of the following conclusions is justified?
1. The object is at the centre of curvature of the mirror.
2. The object is at the focus of the mirror.
3. Only rays parallel to the principal axis can form a real image.
4. The object is nearer to the pople of the mirror than it is to the focal point.
The diagram shows a concave mirror.
Identify the labelled parts.
1. X = centre of curvature, Y = pole, Z = focal length
2. X = centre of curvature, Y = pole, Z = focus
3. X = focus, Y = principal axis, Z = focal length
4. X = radius of curvature, Y = focus, Z = principal axis
The diagram shows a concave mirror.
Identify the labelled parts.
1. X = principal axis, Y = radius of curvature, Z = focal point
2. X = principal axis, Y = centre of curvature, Z = focal point
3. X = pole, Y = radius of curvature, Z = focal point
4. X = radius of curvature, Y = focus, Z = centre of curvature
A ray (blue) passes through X, strikes a concave mirror and is reflected back (pink) through X as shown.
Name X.
1. Centre of curvature
2. Radius of curvature
3. Focal point
4. Pole
What condition is necessary for a real image in a concave mirror?
1. Object outside the focus
2. Object bigger than its image
3. Object smaller than its image
4. Object inside the focus
For a concave mirror what type of image results when an object is place inside the focus?
(Select more than one)
1. Virtual
2. Image behind the mirror
3. Diminished
4. Real
5. Image in front of the mirror
An object is placed 60 cm in front of a concave spherical mirror whose focal length is 40 cm. Which of the following best describes the image?
1. 120 cm from mirror and is real
2. 24 cm from mirror and is real
3. 120 cm from mirror and is virtual
4. 240 cm from mirror and is real
5. 24 cm from mirror and is virtual
An object is placed 60 cm from a spherical convex mirror. If the mirror forms a virtual image 20 cm from the mirror, what’s the magnitude of the mirror’s radius of curvature?
1. 60 cm
2. 7.5 cm
3. 15 cm
4. 30 cm
5. 120 cm
A very narrow light ray strikes the surface of a concave mirror as shown on the diagram.
Which of the following diagrams represents the reflected ray?
A very narrow light ray strikes the surface of a concave mirror as shown on the diagram.
Which of the following diagrams represents the reflected ray?
A very narrow light ray AB strikes the surface of a convex mirror as shown on the diagram.
Which of the following diagrams represents the reflected ray?
An object is placed inside the focal point of a concave mirror.
Which of the following describes the image formed?
1. Virtual, upright, and magnified
2. Virtual, upright, and reduced
3. Virtual, inverted, and reduced
4. Real, upright, and reduced
5. Real, inverted, and magnified
An object is placed 30 cm in front of a concave mirror of focal length 20 cm.
The height of the object is 10 cm, and the height of the image formed is 20 cm.
What is the magnification, and where is the image formed?
1. Magnification = 2 and image is formed 60 cm in front of mirror.
2. Magnification = 2 and image is formed 15 cm in front of mirror.
3. Magnification = 1 and image is formed 30 cm in front of mirror.
4. Magnification = ½ and image is formed 60 cm in front of mirror.
If a man's face is 30 cm in front of a concave shaving mirror creating an upright image 1.5 times as large as the object, what is the mirror's focal length?
1. 90 cm
2. 12 cm
3. 20 cm
4. 18 cm
A virtual image is formed 10.0 cm along the principal axis from a convex mirror of focal length -15.0 cm.
What is the object distance from the mirror?
1. 30 cm
2. 10 cm
3. 12.4 cm
4. 6 cm
A virtual image is formed 10.0 cm along the principal axis from a convex mirror of focal length 15.0 cm.
What is the object distance from the mirror?
1. 6 cm
2. 10 cm
3. 30 cm
4. 12.4 cm
The diagram shows an object placed in front of a concave mirror.
Where will its image be formed?
1. Between c and f
2. At c
3. To the left of c
4. At f
5. Between f and the mirror
Whrich of the following statements is incorrect?
1. The image formed by a concave mirror can be virtual erect and diminished.
2. A convex mirror always forms a virtual image of a real object.
3. The image formed by a convex mirror is always erect and diminished.
4. All real images formed by a concave mirror are inverted.
5. A concave mirror forms an image the same size as the object if the object is placed at the centre of curvature.
A virtual image formed in a coneave mirror cannot be observed on a screen because
1. light rays do not pass through a virtual image.
2. a virtual image has no definite position.
3. a virtual image is not bright enough.
4. a virtual image is formed only in plane mirrors.

Spherical Mirrors

Multiple Choice Quiz