Tag: reflection at plane surface

Questions Related to reflection at plane surface

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 

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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 $60 ^ { \circ }$ .

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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

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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 $07 : 35 : 22$