Lenses and Optics Flashcards
The sign convention for R for a concave lens will be greater than or less than zero?
For a concave lens side the radius(R) will be negative
The sign convention for R for a convex lens will be greater than or less than zero?
For a convex lens side the radius(R) will be positive
In a converging lens the centre of the lens will be thicker than the edges or thinner?
In a converging lens the centre will be thicker than the edges.
In a diverging lens, the centre of the lens will be thicker or thinner than the edges?
The diverging lens will have a centre that is thiner then the edges.
What is a plano convex/concave lens/mirror
it is where one of the sides has a radius of curvature = inf
What is the Lensmaker’s equation?
1/f = (n-1)(1/R1+1/R2)
The focal point for a converging lens will be positive or negative?
Positive
The focal point for a diverging lens will be positive or negative?
Negative
What is the Thin-lens equation
1/f = 1/v+1/u
What is the formula for Angular magnification
M = theta’/theta
What is the formula for maximum magnification?
Mmax = 1 + d/f
What is the formula for minimum magnification?
Mmin = d/f
What is Hyperopia
It is a far-sighted disorder where you can see far but not close
With what type of lens is Hyperopia treated with?
A converging lens
What is Myopia
It is a near-sighted disorder where you can see close but not far.
With what type of lens is Myopia treated with?
A diverging lens
When looking at someone lenses to treat Myopia, will their face look bulged or shrunk?
Their face will look shrunk.
When looking at someone lenses to treat Hyperopia, will their face look bulged or shrunk?
Their face will look bulged
What are the lenses used in a compound microscope?
The first is the eye lens and the second is the objective lens.
In a compound microscope, the object is placed near what lens?
the objective lens.
What type of lenses do compound microscopes use?
Two converging lenses.
Maximum total Magnification is calculated by what equation
M = -L/fo(1+d/fe) where L is the tube length and fo indicates that the object is precicly at the focal length.
What is Chromatic aberration?
It is where the index of refraction of a material varies with the wavelength of the light that passes through it.
In a lens or mirror equation, ‘O’ represents what?
The object height
In a lens or mirror equation, ‘I’ represents what?
The image height
In a lens or mirror equation, ‘u’ represents what?
The object distance
In a lens or mirror equation, ‘v’ represents what?
The image distance
Magnification is is calculated through what formula
M = -v/u = I/O
The sign convection for v will be greater than or less than zero for real images?
Greater than zero.
The sign convection for v will be greater than or less than zero for virtual images?
Less than zero
The sign convection for I will be greater than or less than zero for upright images?
Greater than zero
The sign convection for I will be greater than or less than zero for inverted images?
Less than zero
The sign convection for Magnification(M) will be greater than or less than zero for inverted images?
Less than zero
The sign convection for Magnification(M) will be greater than or less than zero for upright images?
Greater than zero
For a concave mirror, an object inside the focal point will make what type of image?
It will create a virtual image that is larger.
For a concave mirror, an object between the centre of curvature and the focal point will make what type of image?
It will create a real image that is inverted and larger than the object.
For a concave mirror, an object at the centre of curvature(C) point will make what type of image?
It will create a real image that is inverted but exactly the same as the object in height.
For a concave mirror, an object at the focal point will make what type of image?
It will not create any image
What type of image does a convex mirror make when the object is placed at any distance from the mirror
At any distance expect exactly in-front of the mirror it will create a virtual image that is upright and smaller. As the object is moved farther away from the mirror the image slowly approaches the focal point of the mirror
For any type of mirror, v will be positive or negative for a virtual image?
negative
The focal point for a convex mirror will be positive or negative?
negative
