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The angle of incidence is the angle between the incident ray and the normal (perpendicular) to the reflecting surface.
It is the angle between an incident ray and the perpendicular to the surface at the point of incidence.
The incident angle to the Mirror will be 10 deG.
That's the angle of " incidence ".
The incident ray and the normal .
A protractor
a protractor
Your question is unclear but one instrument for measuring angles is a protractor.
Not sure what an instermant is, but an appropriate instrument is a protractor.
there is special instrument named "angle distribution measuring system" for the divergence angle measurement of LEDs. my email: bkk2003@163.com
universal bevel protactor is an angle measuring instrument which measures acute angle ,obtuse angle as well as it is used to layout an angle. its least count is 5 minute.
There's the protractor, a bevel gauge, and the plain ol' measuring tape with pen and paper.Inclinometer.
The angle of incidence is the angle between the incident ray and the normal (perpendicular) to the reflecting surface.
An angle measuring more than 90 degrees is obtuse. An angle measuring less than 90 degrees is acute. An angle measuring 90 degrees is right.
We measure them on the either side of the mirror and not on the side of the normal to the surface of the mirror because, if the mirror or any reflecting surface is bent, then there will be a difference between the angle of incidence and angle reflection which can be avoided by measuring those angles on the either side of the mirror.
It is the angle between an incident ray and the perpendicular to the surface at the point of incidence.
The incident angle to the Mirror will be 10 deG.