Tag: magic with mirrors

Questions Related to magic with mirrors

A ray of light is incident on a plane mirror along a vector $\hat {i} + \hat {j} - \hat {k}$, then find the direction of reflected ray if normal is $\hat i + \hat j$

evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

  1. $\hat {i} + \hat {j} - \hat {k}$

  2. $-\hat {i} + \hat {j} - \hat {k}$

  3. $-\hat {i} - \hat {j} - \hat {k}$

  4. $\hat {i} + \hat {j} + \hat {k}$

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Correct Option: C

When you see reflection of your own in the surface of water, Choose the correct option

evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

  1. The image formed is real

  2. The image formed is inverted

  3. The image formed is erect

  4. None of the above

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Correct Option: C
Explanation:

The image formed by surface of mirror is just like that formed by a mirror.

It is virtual and erect.

Answer-(C)

The phenomena involves in the reflection of radiowaves by ionosphere is similar to

evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

  1. reflection of light by a plane mirror.

  2. total internal reflection of light in air during a mirage.

  3. dispersion of light by water molecules during the formation of a rainbow.

  4. scattering of light by the particles of air.

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Correct Option: B
Explanation:

The ionosphere is the ionized layer of the Earth's atmosphere and its consists of the ions which are formed due to the UV rays coming from the sun. These free electrons result in the reflection of the radio waves and make them reflected back.


This is same as the mirage formation due to the total internal reflection of the rays when the incident angle is greater than the critical angle.

For which of following condition there is no emergent light whatever may be the angle of incidence?

evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

  1. $ A < 2C $

  2. $ A > C $

  3. $ A > 2C $

  4. $ A < C $

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Correct Option: C
Explanation:
For this, we can say that if ${ r } _{ 2 }$ (min) is able to do total internal reflection than definitely all values of ${ r } _{ 2 }$ will perform $TIR$ because min ${ r } _{ 2 }$ has performed that, So, for min ${ r } _{ 2 }$, ${ r } _{ 1 }$ has to be maximum hence $i$ will be maximum,
Applying Snell's law we will get $sin{ r } _{ 1 }=\frac { 1 }{ u } =$ critical angle and for no emergence ${ r } _{ 2 }$ min will be consider us greater than critical angle and hence rest ${ r } _{ 2 }$ will be automatically eligible for $TIR$.
For relation,
${ r } _{ 1 }+{ r } _{ 2 }=A$
We will get ${ r } _{ 1 }+{ r } _{ 2 }=A$
we will get, ${ r } _{ 1 }+{ r } _{ 2 }>2$ (critical angle)
$A>2$ critical angle.

Which of the following is true for kaleidoscope?

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

  1. Same pattern can't be seen twice

  2. Same pattern is seen after equal intervals

  3. Patterns are seen randomly

  4. No pattern seen

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Correct Option: A
Explanation:

It is a specific property of kaleidoscope that same pattern can't be seen twice.

Artists use KALEIDOSCOPE for

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

  1. Entertaining themselves

  2. Getting ideas for new patterns

  3. Discovering new properties of light

  4. None of these

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Correct Option: B
Explanation:

Artists  and designers use KALEIDOSCOPE to get ideas for new patterns.

Which of the following is(are) needed for making a KALEIDOSCOPE

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

  1. Bangles of black colour

  2. Black coloured wooden box

  3. Tiny colourful glass fragments

  4. None of these

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Correct Option: C
Explanation:

Tiny colourful glass fragment specially bangle fragments are required to prepare a KALEIDOSCOPE

How many holes are there in a KALEIDOSCOPE:

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

  1. 1

  2. 2

  3. 5

  4. Cant be predicted

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Correct Option: A
Explanation:

There is one small hole in the cover disc of KALEIDOSCOPE

How many plane mirrors are required for a kaleidoscope?

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

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: C
Explanation:

In a kaleidoscope tube, three rectangular plane mirrors of same size are placed such that the reflecting surfaces face each other. The mirrors are bound together by a string.

Designs of wallpapers and fabrics are obtained with the help of:

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

  1. periscopes

  2. kaleidoscopes

  3. telescopes

  4. microscopes

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Correct Option: B
Explanation:

Beautiful patterns are obtained on rotating the tube of kaleidoscopes.