Refraction, Dispersion And Thin Lenses Flashcards
What is refraction?
The bending of light as it passes from one medium to another with a different density.
True or False: Light travels faster in denser materials.
False
Fill in the blank: The angle of incidence is equal to the angle of __________.
refraction
What is Snell’s Law?
A formula used to describe the relationship between the angles of incidence and refraction when light passes between two different media.
If the refractive index of a medium is 1.5, what does this indicate?
Light travels 1.5 times slower in this medium compared to vacuum.
What phenomenon occurs when white light is separated into its constituent colors?
Dispersion
True or False: The degree of dispersion depends on the wavelength of light.
True
What type of lens is thicker in the middle than at the edges?
Convex lens
What type of lens is thinner in the middle than at the edges?
Concave lens
What is the focal point of a lens?
The point where parallel rays of light converge or appear to diverge after passing through the lens.
Fill in the blank: The focal length of a lens is the distance from the __________ to the focal point.
lens
What is the formula for the lens maker’s equation?
1/f = (n-1)(1/R1 - 1/R2)
In the lens maker’s equation, what does ‘n’ represent?
The refractive index of the lens material.
What happens to light rays when they pass through a convex lens?
They converge towards the focal point.
What happens to light rays when they pass through a concave lens?
They diverge away from the focal point.
True or False: A convex lens can create both real and virtual images.
True
What type of image does a concave lens always produce?
Virtual image
Fill in the blank: The __________ of a lens is the measure of its ability to bend light.
power
What unit is used to measure the power of a lens?
Diopter
True or False: The power of a lens is positive for concave lenses.
False
What does a negative power indicate about a lens?
It is a concave lens.
What is chromatic aberration?
A distortion in the image caused by different wavelengths of light being refracted by different amounts.
What is one way to minimize chromatic aberration in lenses?
Use an achromatic lens.
Fill in the blank: The __________ is the distance from the optical center of the lens to the image formed.
image distance
