study part 4 Flashcards
What is the angle of incidence?
The angle between the incoming ray and the normal line at the surface.
True or False: The angle of reflection is always equal to the angle of incidence.
True
Fill in the blank: The angle of reflection occurs between the reflected ray and the _______.
normal line
Define refraction.
The bending of a wave as it enters a different medium at an angle.
What happens to light when it passes from air into water?
It slows down and bends towards the normal.
What is the normal line?
An imaginary line perpendicular to the surface at the point of incidence.
Multiple Choice: Which law states that the angle of incidence equals the angle of reflection?
Law of Reflection
What is Snell’s Law used for?
To calculate the angle of refraction when light passes between two media.
True or False: The angle of refraction can be greater than the angle of incidence.
False
Fill in the blank: When light travels from a denser medium to a less dense medium, it bends _______ the normal.
away from
What does a higher index of refraction indicate?
That light travels slower in that medium.
Multiple Choice: Which of the following has the highest index of refraction? A) Air B) Water C) Glass D) Diamond
D) Diamond
What is total internal reflection?
The complete reflection of a light ray back into a medium when it hits the boundary at an angle greater than the critical angle.
Define critical angle.
The angle of incidence above which total internal reflection occurs.
True or False: Light can be refracted in a vacuum.
False
Fill in the blank: The change in speed of light when entering a new medium causes _______.
refraction
What is the relationship between the angle of incidence and the angle of refraction in different media?
They are related by Snell’s Law, which involves the indices of refraction of the two media.
Multiple Choice: If the angle of incidence is 30 degrees and the index of refraction of air is 1 and that of water is 1.33, what is the angle of refraction? A) 22.5 B) 30 C) 40 D) 45
A) 22.5
What is the effect of increasing the angle of incidence on the angle of reflection?
The angle of reflection increases and remains equal to the angle of incidence.
Fill in the blank: The bending of light as it passes from one medium to another is called _______.
refraction
What is an example of refraction in everyday life?
A straw appearing bent when placed in a glass of water.
True or False: The speed of light is constant in all media.
False
What happens to light when it hits a reflective surface?
It is bounced back at the same angle as it arrived.
Define the term ‘incident ray’.
The incoming ray of light that strikes a surface.
