Class: Optical::Lens

Inherits:
Object
  • Object
show all
Defined in:
lib/optical/lens.rb

Overview

A representation of a simple thin lens en.wikipedia.org/wiki/Lens_(optics)

Direct Known Subclasses

PlanoConvexLens

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**options) ⇒ Lens

Returns a new instance of Lens.



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# File 'lib/optical/lens.rb', line 9

def initialize(**options)
    options.each {|k,v| respond_to?(k) ? instance_variable_set("@#{k}", v) : raise(ArgumentError, "Unknown argument: '#{k}'") }
end

Instance Attribute Details

#center_thickness ⇒ Object (readonly)

Returns the value of attribute center_thickness.



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# File 'lib/optical/lens.rb', line 28

def center_thickness
  @center_thickness
end

#clear_diameter ⇒ Object (readonly) Also known as: clear_aperture 



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# File 'lib/optical/lens.rb', line 15

def clear_diameter
    @clear_diameter || (2*@clear_radius)
end

#clear_radius ⇒ Object (readonly) 



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# File 'lib/optical/lens.rb', line 22

def clear_radius
    @clear_radius || (@clear_diameter && @clear_diameter/2)
end

#diameter ⇒ Object 



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# File 'lib/optical/lens.rb', line 32

def diameter
    @diameter || 2*@radius
end

#edge_thickness ⇒ Number

Returns the thickness of the Optical::Lens at its edge.

Returns:



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# File 'lib/optical/lens.rb', line 38

def edge_thickness
  @edge_thickness
end

#focal_length ⇒ Object (readonly)

Returns the value of attribute focal_length.



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# File 'lib/optical/lens.rb', line 7

def focal_length
  @focal_length
end

#numerical_aperture ⇒ Object (readonly) 



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# File 'lib/optical/lens.rb', line 42

def numerical_aperture
    Math.sin(Math.atan2(clear_radius || radius, focal_length))
end

#radius ⇒ Object (readonly) 



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# File 'lib/optical/lens.rb', line 48

def radius
    @radius || @diameter/2
end

#thickness ⇒ Object 



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# File 'lib/optical/lens.rb', line 54

def thickness
    [@center_thickness, @edge_thickness].max
end