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###### Vaibhav Singh posted an Question
July 02, 2021 • 08:44 am 30 points
• IIT JAM
• Geology (GG)

## Q45. in the following figure, the exterior angle measured between (001)^(021) with a goniometer in a crystal is 40°. the interior angle between (010)^(021)=??

Q45. In the following figure, the exterior angle measured between (001)^(021) with a goniometer in a crystal is 40°. The interior angle between (010)^(021) in degrees is __________. I AM CONFUSED BETWEEN INTERFACIAL ANGLE AND INTERIOR ANGLE. please clarify so that I can do any problem of Interfacial angle .

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• ##### Mayank vedwal Vedwal Best Answer

interfacial angle is the angle between two faces and interior angle is the angle which lie within the area covered by polygon. Here the internal angle and interfacial angle same for (021) and (010) faces.... This question was asked in iit jam 2016 paper where answer is given 140° but i confirmed with my seniors and with professor , according to them also answer is 130°

thanks Mayank bhaiya..I also was confused little bit.

welcome 😊