Periscope And Kaleidoscope
Periscope And Kaleidoscope
We know that plane mirror reflects light falling on it. This reflected ray can act as incident ray for another mirror. This process of reflection of light several times between reflecting surfaces is known as Multiple reflection of light.
Periscope:
This instrument works on the principle of multiple reflection. A periscope is a tool we use to see things that would otherwise be hidden or obstructed or not in the direct line of sight.
Construction: A reflecting periscope consists of a tube bent twice at right angles. It is provided with two openings and two plane mirror fixed at at the two bends of the tube.. The mirrors are aligned parallel to each other at a angle with the addition of two simple lenses.
Working: The rays of light from the object enter the periscope from one tube (Upper tube in the figure), gets reflected twice and enters the eye of the person looking through the periscope.
Uses of periscope:
Kaleidoscope :
In this toy beautiful patterns are formed due to multiple reflections. It works on the principle of multiple reflection in inclined plane mirrors. It is a long tube containing mirror and piece of colored glass or paper whose reflection produces changing patterns when tube is rotated.
Kaleidoscope
Construction: Three plane mirrors inclined at an angle of to each other are fixed inside a cylindrical box. A few pieces of coloured glasses are placed inside the box. One end of the cylindrical box has a transparent opening through which a person can view.
This process of reflection of light several times between reflecting surfaces is known as ________________________ . | |||
| Right Option : A | |||
| View Explanation | |||
Periscope is the instrument which works on the principle of _______________________. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) A Kaleidoscope is used in submarine to determine distance objects . (b) In a Kaleidoscope, three plane mirrors inclined at an angle of | |||
| Right Option : B | |||
| View Explanation | |||
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My experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
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Om Umang
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Shivam Rana
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Manish Kumar
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10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
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Aman Kumar Shrivastava
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Yatharthi Sharma
10thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
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Cheshta
10thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
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