Tag: magic with mirrors

Questions Related to magic with mirrors

Modern Kaleidoscopes are made of what?

evs magic with mirrors kaleidoscope uses of plane mirror reflected light can be reflected again

  1. Brass Tubes

  2. Stained Glass

  3. Wood

  4. All of the above

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Correct Option: D
Explanation:

Brass tube,stained glass and wood all are used to make kaleidoscopes. We can also make it at home with plastic, paper towel and some pieces of glass , beads and colorful items.

Some special kaleidoscopes which doesn't include objects at all are known as:

evs magic with mirrors kaleidoscope uses of plane mirror reflected light can be reflected again

  1. Teleidoscopes

  2. Telescopes

  3. Spy glass

  4. None of above

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Correct Option: A
Explanation:

Teleidoscope is a type of kaleidoscope with a lens which create patterns without any other objects in the tube.

An object is kept between two plane mirrors inclined at an angle $120$ from each other; calculate the number of images which are formed if the object is not on the bisector/on the bisector $3$

evs magic with mirrors kaleidoscope uses of plane mirror reflected light can be reflected again

  1. $\displaystyle \frac {3}{3}$

  2. $\displaystyle \frac {3}{2}$

  3. $\displaystyle \frac {2}{2}$

  4. $\displaystyle \frac {2}{3}$

Show answer
Correct Option: B
Explanation:

Given: An object is kept between two plane mirrors inclined at an angle 120 from each other

To find the ratio of number of images which are formed if the object is not on the bisector and on the bisector
Solution:
If there are two plane mirrors inclined to each other at an angle $\theta$, the number of images of a point object formed are determined as follows:

If $\left(\dfrac {360^\circ}\theta\right)$ is odd integer (say $m$) number of images formed
$n = m$, if the object is not on the bisector of mirrors
$n = (m – 1)$, if the object is on the bisector of mirrors.

So, when $\theta=120^\circ$, we get
$m=\dfrac {360}{120}=3$
So,
$\dfrac {\text{ number of images which are formed if the object is not on the bisector}}{\text{ number of images which are formed if the object is on the bisector}}=\dfrac {3}{3-1}=\dfrac 32$

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

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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

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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

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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

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.