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The video include 3 different light experiments which involve glass block and pins.
Most students faced difficulties in locating the pins through the glass block. It is important to close one eye and use your master eye to view.
Hope this video helps!
In experiments like this, the sources of error include:
– the holes created by the pins are too big, hence the line drawn using the two holes may not be very precise, hence affecting the distance/angle measured (depends on experiments)
– When putting back the glass block back on the paper, the position may be not exactly the same, hence affecting the angle/distance measured.
As a precaution, it is good to ensure that the distance between the two pins are more than 4 – 5 cm. With the holes further apart, the line drawn will be more accurate.
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