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Major VersionM

by Procheta Mallik

Introduction

Using the given Tactivity tube, we make a periscope. Make two holes at the two opposite ends of the tube - one for light from the object and one for light to enter the eyes. Fix mirrors at both ends of the tube such that the angle at which the mirrors can be placed can be changed.

Change the angles of both the mirrors and predict the range of your view based on laws of reflection. Test your prediction using the periscope made

    • Scissors have functional sharp edges. Contact may result in injury. Always keep blades away from fingers and body. Handle with care.

  1. Take a printout periscope template attached below.
    • Take a printout periscope template attached below.

    • Place two templates: page 1 towards your right side and page 2 towards your left side, as shown in the image and join them using clear tape on the plain side.

    • Cut along GREEN dotted line only (i.e. page 1 and page 2 (Phase I)), before pasting it on the tube. (Length of the tube - 24 cm)

    • Do not cut along any other dotted lines

    • Paste the template on the tube using glue.

    • Cut off the extra bits, if any, using scissors.

    • Cut along the black dotted lines using scissors/cutter; the body of the periscope is now ready.

    • Take the page 2 (Phase 2) template and paste it on a cardboard sheet of A4 size.

    • Cut along the dotted lines using scissors and fold along the solid bold lines.

    • Now, take the flap and fold the 'C' strip onto the 'B' strip, 'A' strip onto 'B' strip. You will thus get a doubled-up strip.

    • Paste it using glue.

    • Match and fold 'D' with respect to its colour and place it on the square as shown in the image and glue it.

    • Fold along the solid bold lines as shown in the image.

    • Make sure the protractor scale is on the inner side.

    • Take a metal cap of the tube .

    • Paste the centre square of the template on the inner surface of the metal cap using glue.

    • While pasting the template on the metal cap, make sure two corners of the same square meet the circumference of the circle as shown.

    • Paste a 5 cm by 5 cm mirror onto the outer side of the same face where the flaps are attached, using white glue, and peel off the transparent sheet off the mirror.

    • Follow the same procedure with the other metal cap.

    • Insert the controlling flap from inside of the tube, through the small rectangular slits made, and fix it.

    • Fix the metal cap on to the tube using glue.

    • Do the same at the other end of the tube to fix another mirror holder. And let them dry.

    • With the help of the protractor scale attached, we can measure the angle of the eye piece mirror and the angle of the objective mirror.

    • Now, your periscope is ready.

    • Consider the lower opening as the eye piece and the other opening as the objective.

    • Place the eye piece near your eye and adjust the flap, until you see an image on the objective mirror.

    • Try varying the angle of the objective mirror and look at the image.

    • With the help of the periscope, look at an object. (Here, we are looking at the upper knob of the window)

    • Note down the angle of the eyepiece mirror and angle of the objective mirror, with the help of the protractor scale attached inside.

    • Vary the distance between the person viewing and the object; try viewing the same object again and note down the angles.

    • Do not crumple the template.

    • Make sure that mirror is free from scratches.

    • Take a printout of the periscope template attached below.

    • Place four templates pages: page 1 on the top right, page 2 on the top left, page 3 below page 1 (bottom right) and page 4 below page 2 (bottom left), as shown in the image. Join them using clear tape on the plain side.

    • Cut along the GREEN dotted line only, and paste it on the tube. (Length of the tube - 30.6 cm).

    • Repeat the same procedure from Step 2 to Step 7 above. (Use the 7cm X 7cm mirror instead).

Finish Line

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Kailash NR

Member since: 05/02/2017

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