Tag: evs

Questions Related to evs

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

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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

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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

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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

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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.

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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

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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 

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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

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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