Light And Optics Flashcards
What is light?
Light is a form of electromagnetic radiation that is visible to the human eye.
True or False: Light travels faster in water than in air.
False
Fill in the blank: The unit of measurement for light intensity is ______.
lumen
What is the speed of light in a vacuum?
Approximately 299,792 kilometers per second.
What phenomenon causes a straw to appear bent when placed in a glass of water?
Refraction.
What do we call the bouncing back of light when it hits a surface?
Reflection.
Which color of light has the longest wavelength?
Red.
What is the term for the angle between the incident ray and the normal line?
Angle of incidence.
True or False: Concave mirrors can produce virtual images.
True.
What is the main function of a lens?
To refract light to form an image.
In which medium does light travel the slowest?
In a solid.
What type of lens is thicker in the center than at the edges?
Convex lens.
What is the term for light spreading out after passing through a narrow opening?
Diffraction.
Fill in the blank: The process by which light is absorbed and converted into energy is called ______.
Absorption.
What is total internal reflection?
The phenomenon where light reflects entirely within a medium when it hits the boundary at a steep angle.
Which type of mirror always produces a virtual image?
Plane mirror.
What does the term ‘opaque’ mean?
A material that does not allow light to pass through.
True or False: A prism can separate white light into its component colors.
True.
What is the range of wavelengths for visible light?
Approximately 400 to 700 nanometers.
What is the function of the cornea in the eye?
To refract light entering the eye.
What type of image is formed by a convex lens when the object is beyond the focal point?
Real and inverted image.
Fill in the blank: The bending of light as it passes from one medium to another is called ______.
Refraction.
What is the focal point of a lens?
The point where parallel rays of light converge or appear to diverge.
True or False: Light can behave both as a wave and as a particle.
True.
