Tag: uses of plane mirror

Questions Related to uses of plane mirror

When does the tumbling of coloured objects presents varying colours and patterns in kaleidoscope?

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

  1. When kaleidoscope tube is stood erect

  2. When kaleidoscope tube is tilted at $180^0$

  3. When kaleidoscope tube is rotated

  4. When kaleidoscope tube is inverted

Show answer
Correct Option: C
Explanation:

When kaleidoscope tube is rotated then it forms different varying patterns and colours.

How many rectangular mirrors are there in kaleidoscope which yields to pattern filling entire field?

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

  1. 1

  2. 5

  3. 3

  4. 4

Show answer
Correct Option: C
Explanation:

Kaleidoscope can be either of 2 or 3 mirrors. 3 mirrors yield to a pattern which fills entire field.

Who invented Kaleidoscope ?

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

  1. Sir David Brewster

  2. Sir Isaac Newton

  3. Albert Einstein

  4. Dr. Homi Bhabha

Show answer
Correct Option: A
Explanation:

Sir David Brewster invented Kaleidoscope.

At what angle the rectangular mirrors are set to each other in Kaleidoscope?

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

  1. 90 degree

  2. 30 degree

  3. 60 degree

  4. 120 degree

Show answer
Correct Option: C
Explanation:

All 3 mirrors are placed at 60 degree angle to have a different colourful pattern  inside the Kaleidoscope.

What is Kaleidoscope?

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

  1. A cylinder with mirrors containing loose colored objects such as beads, pebbles, and bits of glass

  2. A cylinder with mirrors

  3. A cylinder containing loose colored objects such as beads, pebbles, and bits of glass

  4. None of the above

Show answer
Correct Option: A
Explanation:

$Answer:-$ A option

A kaleidoscope is an optical instrument, typically a cylinder with mirrors containing loose, colored objects such as beads or pebbles and bits of glass. As the viewer looks into one end, lightening the other end creates a colorful pattern, due to repeated reflection in the mirrors.

In kaleidoscope the part containing objects to be viewed is known as :

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

  1. Object Chamber

  2. Object House

  3. Object Lobby

  4. None of the above

Show answer
Correct Option: A
Explanation:

All objects are loosely placed on other end of Kaleidoscope which is known as Object chamber

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

Show answer
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

Show answer
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,
$\dfrac {\text{ number of images which are formed if the object is not on the bisector}}{\text{ number of images which are formed if the object is on the bisector}}=\dfrac {3}{3-1}=\dfrac 32$