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  • Question 1
    1 / -0

    How many mirrors are used in a periscope?

  • Question 2
    1 / -0

    Which of the following instrument is used for observing people/things without letting the people know of it.

  • Question 3
    1 / -0

    In a periscope, plane mirrors are fixed at the bends of the tube at an angle of _________ with the side of the tube.

  • Question 4
    1 / -0

    Periscope is used for:

  • Question 5
    1 / -0

    Which of the following is not the proper use of a periscope?

  • Question 6
    1 / -0

    Periscope is fitted with:

  • Question 7
    1 / -0

    Inner side of the cylindrical tube of a periscope is blackened to avoid:

  • Question 8
    1 / -0

    The mirror used in periscope is: 

  • Question 9
    1 / -0

    Colourful patterns are formed in a kaleidoscope by:

  • Question 10
    1 / -0

    Kaleidoscope works on the principle of:

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