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25 Sep 19
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Measuring angles from photo

Wednesday 25 September 2019

Amtul asked how to measure angles on a digital photo of light reflecting off a curved mirror, here's how to do it in GeoGebra.

First I insert the image (a screen shot from Algodoo). Then make it the background (right click object properties). Then I made a circle and adjusted it so that it gave the centre of curvature. A line was placed to act as a normal. The angles can then be measured with angle tool.

Good luck.

The big bang
10 Sep 2019

Comments 1

Amtul Qayyum 25 September 2019 - 16:24

I highly appreciate the help. Thanks

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