A light ray falls normally on a boundary separating two medium .What is the angle of incidence?

Answer 1

90 degrees, because "normal" in this context means "perpendicular".

Answer 2

The speed of light is affected y the medium through which it travels .the thicker the medium he lessor the speed of the light through that medium.. Suppose , a beam / ray of light falls on the surface of a glass plate. The density of the glass being higher than the air , the beam suffers a loss of its speed from the point of its entry into the glass till it comes out of the glass through the other side of the glass . The surface of the glass being horizantal, the angle between the horizontal and the angle atwhich the light ray enters the glass is called the angel of of incidence .. The angle at which the the light ray travels inside the glass after hitting the surface and on entering the glass plate is the anglke of refraction.Acceleration , the change in speed causes a chnge in the direction of the travel of the light . Thus when the lgiht leaes the dense medium and enters the rare medium , it restores its origianl speed and since thre is an increase in the acceleration , the ray of light ndergoes a chnge in its direction too.

Answer 3

The angle of incidence is Zero, when the ray falls normally. So, there will be no refraction and the beam goes straight through the second medium.

Answer 4

my dear friend ,
you must understand the convention of incidence angle.. incidence angle refractive angle and reflective angles are measured from the normal of the medium-separating-line..so if ray is normal to the boundary then it's parallel to normal, so angle between two parallel lines is zero.so incidence angle is zero in this case.

Answer 5

i think it is 90 degrees as the meaning of 'normal 'is perpendicular as it always forms 90 degrees. the angle of incidence is the angle formed between the normal and the incident ray

Answer 6

0 degree

Answer 7

90 degree