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Lateral inversion - class-VII

Description: lateral inversion
Number of Questions: 20
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Tags: reflection of light our colourful world light physics evs reflection of light and shadow mirrors and reflections magic with mirrors
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Fill in the blank:

A boy blinks his right eye. Mirror image of the boy blinks its ______ eye.

physics reflection of light and shadow lateral inversion right or left reflection at plane surface

  1. both

  2. right

  3. none

  4. left

Show answer
Correct Option: D
Explanation:

Due to lateral inversion by mirror, right appears on left and left appears on right.

The image formed by a plane mirror is always ....... inverted.

physics reflection of light and shadow lateral inversion right or left reflection at plane surface

  1. laterally

  2. virtually

  3. really

  4. none

Show answer
Correct Option: A
Explanation:

The image formed by a plane mirror is always Laterally inverted.

Mark correct option.

physics reflection of light and shadow lateral inversion right or left reflection at plane surface

  1. The laws of reflection of light hold only for plane surfaces

  2. The size of virtual image can be measured by receiving it on screen

  3. Plane mirror alongs form an erect image

  4. Plane mirror may form inverted image

Show answer
Correct Option: D
Explanation:

Let solve it by each option

  1. Law of reflection of light holds good for all the mirrors irrespective of their shape and size, hence option A is false
  2.  A virtual image cannot be caught on screen so we cannot measure the size, it is also a false statement
  3. Plane mirror always forms a virtual image, hence it's a false statement
  4. Light rays  which comes from the object  get reflected from plane mirror and reaches to human eye, at this point human feel that reflected ray is coming from the mirror . This is the reason why object looks laterally inverted
  5. Hence option D is the right answer

The sideways reversal of the image by plane mirror is called :

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. lateral inversion

  2. parallax

  3. optical illusion

  4. magic

Show answer
Correct Option: A
Explanation:

The sideways reversal of the image by plane mirror is called lateral inversion

Lateral inversion is a feature of plane mirrors, in which:

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. The top part of the object appears to be the bottom part of the image.

  2. The left side of the object appears to be the right side of the image.

  3. Image appears to be inverted upside down and also sideways.

  4. All of the above.

Show answer
Correct Option: B
Explanation:
$ \bf{Lateral\ Inversion} $ is the phenomenon in which when looked through a mirror, the left-hand side of an object appears as right-hand side of the image and vice versa.

Hence, the correct answer is OPTION B.

An unlabeled analog clock is kept in front of mirror. Actual time on clock is 3. What is time in the mirror image?

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. 3

  2. 9

  3. 6.15

  4. 9.30

Show answer
Correct Option: B
Explanation:

Due to lateral inversion, hour hand of image points to 9. Minute Hand keeps pointing to 12. Hence, time in mirror image is 3.

A boy rotates his arm in clockwise direction in front of mirror. His mirror image rotates its arm in:

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. anticlockwise direction

  2. clockwise direction

  3. oscillatory motion

  4. insufficient info

Show answer
Correct Option: A
Explanation:

Due to lateral inversion caused by plane mirror, direction of rotation reverses.

8OYATU in plane mirror appears as :

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. 8OYATU

  2. 8OYatu

  3. UTAYO8

  4. 8oYATU

Show answer
Correct Option: C
Explanation:

All letters given are symmetric laterally. When it undergoes reflection, letters reverse order but each looks individually the same.

A boy in front of mirror throws ball from right hand and catches with left hand. The direction of image of ball as seen from image of boy is:

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. Right hand to left hand

  2. Left hand to Right Hand

  3. Right hand to Right Hand

  4. Left Hand to Left Hand

Show answer
Correct Option: B
Explanation:

Due to lateral inversion of boy, left appears on right and right on left. 

Why is it difficult to read from image of a book in plane mirror?

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. Due to lateral inversion

  2. Due to scattering

  3. Due to vertical inversion

  4. Due to loss on reflection

Show answer
Correct Option: A
Explanation:

On reflection, Objects undergo lateral inversion.

Most of the alphabets are not symmetrical laterally and on reflection produce unrecognizable alphabets. Also, letters on the right appear on the left. This hurt the sequence of letters and makes words and sentences meaningless.

Why is AMBULANCE written laterally inverted on an Ambulance van?

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. It gathers more attention since it is laterally inverted.

  2. Vehicle in front sees a laterally inverted image and perceives it correctly, hence giving side to the ambulance van.

  3. Vehicle in front sees a virtually erect image and perceives it correctly, hence giving side to the ambulance van.

  4. None of the above.

Show answer
Correct Option: B
Explanation:

Ambulance is usually in a hurry. In order to convey the vehicle in front that it is an ambulance, it is written laterally inverted. When the driver of the vehicle in front reads through the rear-view mirror, the Image of this inscription, through lateral inversion, form a right oriented image.

Interchange of left and right sides of an object in a plane mirror is known as:

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. reflection

  2. refraction

  3. lateral inversion

  4. all

Show answer
Correct Option: C
Explanation:

The interchange of the left and right sides in the image of the object in a plane mirror is known as lateral inversion. In our daily experience, while looking in a mirror, the pocket of the left appears to be on the right of the image is also an example of lateral inversion.

Lateral inversion is generally seen in case of:

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. convex mirror

  2. concave mirror

  3. plane mirror

  4. all of the above 

Show answer
Correct Option: C
Explanation:

The interchange of the left and right sides in the image of an object in a plane mirror is called lateral inversion.

In lateral inversion.

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. Right side of the object will be right side of the image

  2. Left side of the object will be left side of the image

  3. Upside of the object will be down side of the object

  4. Right side of the object will be left side of the image

Show answer
Correct Option: D
Explanation:

Concept of lateral inversion in plane mirror is nothing but  the right side of the object will be left side of the image where the left side of object will be right side of the image vice versa is applicable.

Two plane mirrors at an angle such that a ray incident on a mirror undergoes a total deviation of  $240 ^ { \circ }$ after two reflections. 

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. the angle between the mirrors is $60 ^ { \circ }$

  2. the number of images formed by this system will be 5 , if an object is placed symmetrically between the mirrors.

  3. the no. of images will be 6 if an object is kept unsymmetrically between the mirrors.

  4. a ray will retrace its path after 2 successive reflections, if the angle of incidence on one mirror is $60 ^ { \circ }$ .

Show answer
Correct Option: A

A clock fixed on a wall shows time $04:25:37$. What time will its image in a plane mirror show?

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. $07:43:32$

  2. $07:43:32$

  3. $07:35:23$

  4. $43:27:36$

Show answer
Correct Option: C
Explanation:
  • Given that in question actual time and its image will show same interpreted time at  06:00:00 and 12:00:00
  • Now , 06:00:00 - 04:25:37 = 01:34:23. This means the time 04:35:27 is 1 hour 34 minutes and 23 seconds to 06:00:00.
  • So the interpreted image of this time is 1 hour 34 minutes and 27seconds past  06:00:00; that is, 07:34:27
  • Hence the option C is the right answer

Which of the following letters will be seen with some change in a plane mirror?

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. M

  2. T

  3. L

  4. W

Show answer
Correct Option: C
Explanation:

Reflection through a plane mirror causes lateral inversion to the image.

The letters, M, T and W are laterally symmetric. So, no change will be observed after these letters are reflected on a plane mirror. The letter, L is not laterally symmetric. So, it will undergo lateral inversion and the image will appear different from the object.

In the image formed by a plane mirror, the left of the object appears on the right and the right appears on the left. This is called lateral inversion.

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Lateral inversion is a phenomenon in which the left side of object becomes right side of image and right side of object appears as left side of image.


Given statement is $True$.

While standing in front of a plane mirror, if you touch your ............ ear with the  right hand, it will be seen in the mirror that your right ear is touched with your ................ hand.

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. Right, left

  2. Left, left

  3. Right, right

  4. Left, right

Show answer
Correct Option: A,D
Explanation:

Right, Left or Left, Right both are correct,because thats the property of mirror.

A clock fixed on a wall shows time 04 : 25 : 37. Its image in a plane mirror shows :

evs magic with mirrors lateral inversion right or left reflection at plane surface

  1. 07 : 30 : 33

  2. 07 : 43 : 32

  3. 07 : 35 : 22

  4. 43 : 27 : 36

Show answer
Correct Option: C
Explanation:

After reflection,
Image of the hour hand will look like its pointing between 7 and 8.
Image of the minute hand will look like its pointing at 7.
Image of the hour hand will look like its pointing between 4 and 5.
So the time will appear to be $07 : 35 : 22$

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