Plane Mirrors

1. The virtual image produced by a plane mirror appears to be the same distance away from the mirror as the object itself.

True

False

A plane mirror reflects light rays in a way that they appear to come from behind the mirror. This creates a virtual image that is formed at the same distance behind the mirror as the object is in front of it. This is because the angle of incidence is equal to the angle of reflection, causing the reflected rays to appear to originate from the same distance as the object. Therefore, the statement is true.

Explanation

A plane mirror reflects light rays in a way that they appear to come from behind the mirror. This creates a virtual image that is formed at the same distance behind the mirror as the object is in front of it. This is because the angle of incidence is equal to the angle of reflection, causing the reflected rays to appear to originate from the same distance as the object. Therefore, the statement is true.

2. The height of an image as seen in a plane mirror is the same as the actual height of the object.

True

False

When an object is placed in front of a plane mirror, the image formed is virtual and appears to be behind the mirror. The image is a reflection of the object and is of the same size as the object. Since the distance between the mirror and the object is the same as the distance between the mirror and the image, the height of the image is equal to the actual height of the object. Therefore, the statement is true.

Explanation

When an object is placed in front of a plane mirror, the image formed is virtual and appears to be behind the mirror. The image is a reflection of the object and is of the same size as the object. Since the distance between the mirror and the object is the same as the distance between the mirror and the image, the height of the image is equal to the actual height of the object. Therefore, the statement is true.

3. What is the size and position of an image formed by a plane mirror?

Same size, closer to the mirror

Same size, same distance away from the mirror

Enlarged, closer to the mirror

Reduced, farther from the mirror

When an image is formed by a plane mirror, it is always the same size as the object and is located at the same distance away from the mirror as the object is. This is because a plane mirror reflects light rays in a way that preserves the size and distance relationships between the object and its image. Therefore, the correct answer is that the image formed by a plane mirror is the same size and at the same distance away from the mirror as the object.

Explanation

When an image is formed by a plane mirror, it is always the same size as the object and is located at the same distance away from the mirror as the object is. This is because a plane mirror reflects light rays in a way that preserves the size and distance relationships between the object and its image. Therefore, the correct answer is that the image formed by a plane mirror is the same size and at the same distance away from the mirror as the object.

4. An object is placed 100 cm from a plane mirror. How far is the image from the object?

400 cm

300 cm

200 cm

100 cm

50 cm

distance from object to mirror = 100cm distance from mirror to image = 100cm distance from object to image = 100 +100 = 200cm

Explanation

distance from object to mirror = 100cm distance from mirror to image = 100cm distance from object to image = 100 +100 = 200cm

5. Which of the following best describes the image from a plane mirror?

Virtual and magnification greater than one

Real and magnification less than one

Virtual and magnification equal to one

Real and magnification equal to one

Magnification =hi/ho since hi = ho magnification = 1 ( a positive magnification means upright image)

Explanation

Magnification =hi/ho since hi = ho magnification = 1 ( a positive magnification means upright image)

6.

if the flame on the candle is 2 cm tall, how tall is the flame of the image?

1cm

2cm

4cm

8cm

object height = image height in plane mirrors

Explanation

object height = image height in plane mirrors

7. A candle is placed near a plane mirror as shown below. At which point is the image of the candle formed.

A

B

C

D

E

The image of the candle is formed at point C because the light rays from the candle reflect off the plane mirror and converge at point C.

Explanation

The image of the candle is formed at point C because the light rays from the candle reflect off the plane mirror and converge at point C.

8. Virtual images are formed from divergent rays

True

False

Virtual images are formed by the apparent intersection of diverging rays. These rays do not actually converge to a point but appear to do so when traced back. This is in contrast to real images, which are formed by the actual convergence of rays. In the case of virtual images, the rays appear to diverge from a point behind the mirror or lens, resulting in an image that cannot be projected onto a screen. Therefore, the statement "Virtual images are formed from divergent rays" is true.

Explanation

Virtual images are formed by the apparent intersection of diverging rays. These rays do not actually converge to a point but appear to do so when traced back. This is in contrast to real images, which are formed by the actual convergence of rays. In the case of virtual images, the rays appear to diverge from a point behind the mirror or lens, resulting in an image that cannot be projected onto a screen. Therefore, the statement "Virtual images are formed from divergent rays" is true.

9. A plane mirror produces a top-to-bottom reversal and a left-to-right reversal.

True

False

Plane mirrors produce a front to back reversal of the image

Explanation

Plane mirrors produce a front to back reversal of the image

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

The wavelength of light used for viewing.

. the distance from the object to the mirror.

The distance of both the observer and the object to the mirror.

The size of the object.

The distance from the mirror to the image depends on the distance from the object to the mirror. This is because the image formed by a plane mirror is virtual, meaning it is formed by the apparent intersection of the reflected rays. The rays of light from the object bounce off the mirror and appear to come from behind the mirror, creating the image. The distance between the object and the mirror determines the angle at which the rays reflect and thus affects the position of the image.

Explanation

The distance from the mirror to the image depends on the distance from the object to the mirror. This is because the image formed by a plane mirror is virtual, meaning it is formed by the apparent intersection of the reflected rays. The rays of light from the object bounce off the mirror and appear to come from behind the mirror, creating the image. The distance between the object and the mirror determines the angle at which the rays reflect and thus affects the position of the image.

11. An object represented by the grey arrow, is placed in front of a plane mirror. Which of the diagrams below best represents the image,represented by the pink arrow?

A

B

C

D

image is reversed front to back in plane mirrors

Explanation

image is reversed front to back in plane mirrors

12. A man stand two meters away from a plane mirror. How far is it from the man to his image?

2.0 m

3.0 m

4.0 m

5.0 m

When a person stands in front of a plane mirror, the image appears to be the same distance behind the mirror as the person is in front of it. Therefore, the distance from the man to his image is also 2 meters.

Explanation

When a person stands in front of a plane mirror, the image appears to be the same distance behind the mirror as the person is in front of it. Therefore, the distance from the man to his image is also 2 meters.

13. A plane mirror produces a same-size real image.

True

False

A plane mirror does not produce a real image. Instead, it creates a virtual image. The characteristics of a plane mirror include:

Virtual Image: The image appears to be behind the mirror, but it doesn't actually exist in physical space. You cannot project this image onto a screen.

Same Size: The virtual image produced by a plane mirror is the same size as the object.

Laterally Inverted: The image appears reversed left-to-right.

Therefore, a plane mirror does not create a real image, so the correct answer is False.

Explanation

A plane mirror does not produce a real image. Instead, it creates a virtual image. The characteristics of a plane mirror include:

Virtual Image: The image appears to be behind the mirror, but it doesn't actually exist in physical space. You cannot project this image onto a screen.

Same Size: The virtual image produced by a plane mirror is the same size as the object.

Laterally Inverted: The image appears reversed left-to-right.

Therefore, a plane mirror does not create a real image, so the correct answer is False.

14. If di= -do, then what is the meaning of the negative sign?

The image is inverted

The image is smaller

The image is virtual

The image is larger

the minus means the image is behind the mirror- so virtual

Explanation

the minus means the image is behind the mirror- so virtual