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Q: What happens to the angle of the wave if it hits the perspex at 90 degrees?

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It is reflected 90 degrees from its original direction.

By convention angles are measured from the normal to the reflecting surface. The angle of incidence, 35 degrees, is equal to the angle of reflection. In this case 35 degrees. The answer is 35 degrees.

http://billiards.colostate.edu/threads/banks_and_kicks.html

If the ray hits the mirror at an angle of 30 degrees with the mirror surface, the complementary angle that the ray makes with the normal (perpendicular) to the mirror at the point of incidence is (90 - 30) = 60 degrees and since angle of incidence is equal to angle of reflection in a plane mirror, the angle of reflection is 60 degrees.

96 degress? If the light ray is straight, and if the mirror isn't bent, then the angle of reflection is exactly 48 degrees, the same number of degrees as the angle of incidence. That's the law of reflection.

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what happens is the light is refracted or bent to the normal as in the other surface the line is refracted away from the normal refracted light coming out of the perspex block is parallel to the incident light refraction is caused as the light hits the block from a different angle lets say 25 degrees the particles are normally all lined up and go the same speed but as it hots the block from a different angle one particle will hit first the block and then the next and so on making each particle separate causing it to bend.

40 degrees

40 DEGREES

It is reflected 90 degrees from its original direction.

The angle of reflection is 40 degrees. The angle of incidence is equal to the angle of reflection.

THE energy is spread out over a larger area and is less intense

fills up it

the angle of the ray of reflection is equal to the angle of the ray of incidence, in other word if a light wave hits glass at an angle of 30 degrees, the angle of reflection will also be 30 degrees

No, an acute angle must measure between 0 and 90 degrees exclusive. So if it were 89.999999999 degrees, it is still an acute angle, but once the degree hits 90, it can only be a right angle.

By convention angles are measured from the normal to the reflecting surface. The angle of incidence, 35 degrees, is equal to the angle of reflection. In this case 35 degrees. The answer is 35 degrees.

http://billiards.colostate.edu/threads/banks_and_kicks.html

An obtuse angle. There cannot be an angle with more than 180 degrees so it starts to count backwards when it hits 180. So instead of having a 190 degree angle, you have a 170 degree angle.