light Flashcards
What is light?
Light is a form of energy that travels in waves and can be perceived by the human eye.
True or False: Light can travel through a vacuum.
True
Fill in the blank: The speed of light in a vacuum is approximately _____ km/s.
300,000
What is the primary source of natural light on Earth?
The Sun
What are the two main properties of light?
Reflection and refraction
Define reflection of light.
Reflection of light is the bouncing back of light rays when they hit a surface.
What is a plane mirror?
A plane mirror is a flat, smooth surface that reflects light to form an image.
Multiple Choice: Which of the following is NOT a law of reflection? A) Angle of incidence = Angle of reflection B) Light travels in straight lines C) Light can be absorbed D) Reflection occurs at any angle.
D) Reflection occurs at any angle.
What is the angle of incidence?
The angle between the incident ray and the normal at the point of incidence.
What is the angle of reflection?
The angle between the reflected ray and the normal at the point of incidence.
True or False: Refraction occurs when light passes from one medium to another.
True
What causes light to refract?
The change in speed of light as it moves from one medium to another.
Fill in the blank: The bending of light as it passes through a prism is called _____.
dispersion
What is a convex lens?
A convex lens is a lens that is thicker in the middle than at the edges and converges light rays.
What is a concave lens?
A concave lens is a lens that is thinner in the middle than at the edges and diverges light rays.
Multiple Choice: Which type of lens is used in magnifying glasses? A) Convex B) Concave C) Both A and B D) Neither A nor B
A) Convex
What is the phenomenon of total internal reflection?
Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle.
True or False: A rainbow is an example of light dispersion.
True
What determines the color of light?
The wavelength of the light determines its color.
Fill in the blank: The visible spectrum of light ranges from _____ to _____ nanometers.
400 to 700
What is the primary function of the human eye in terms of light?
The human eye detects light and allows us to see.
Multiple Choice: Which part of the eye adjusts the amount of light entering? A) Cornea B) Retina C) Iris D) Lens
C) Iris
What is the role of the lens in the human eye?
The lens focuses light onto the retina.
True or False: Light can be polarized.
True
