Tag: evs

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Questions Related to evs

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

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:

  1. Right hand to left hand

  2. Left hand to Right Hand

  3. Right hand to Right Hand

  4. Left Hand to Left Hand
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  1. Due to lateral inversion

  2. Due to scattering

  3. Due to vertical inversion

  4. Due to loss on reflection
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Why is AMBULANCE written laterally inverted on an Ambulance van?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. reflection

  2. refraction

  3. lateral inversion

  4. all
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

In lateral inversion.

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  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 $60 ^ { \circ }$ .
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The deviation produced by two mirrors inclined at angle theta is d = 360 - 2*theta. Given d = 240, 240 = 360 - 2*theta, so 2*theta = 120, theta = 60 degrees.

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

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

  1. $07:43:32$
  2. $07:43:32$
  3. $07:35:23$
  4. $43:27:36$
Reveal answer Fill a bubble to check yourself
C Correct answer
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