Micrometer Stand

Quick question: what does 'd' stand for (nλ d sin θ)?
I think it's distance from the slit to the screen, but I got an answer in micrometers and that seems fairly small..
Also Wikipedia isn't answering my questions, so don't direct me there please =]
sorry, yep, diffraction. That would make more sense. Thanks!
d is the separation of the two slits.
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Deluxe Micrometer Stand
Sale Price: $27.00
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Deluxe Micrometer Stand is Adjustable To Any Position. Modern Styled Cast iron Stand With lacquer Coating and Adjustable Clamp.
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Anytime Tools 0-6" PREMIUM OUTSIDE MICROMETER MACHINIST TOOL SET w/CARBIDE TIPS + 6 pc 5/16" - 6" PRECISION TELESCOPIC T BORE GAUGE SET + Micrometer Stand
Sale Price: $134.99
Average Rating: 
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Premium Quality Professional Precision Measuring Tools 0-6" Micrometer Set: Crisp, clear, easy-to-read graduation, accurate to .0001''. Hardened and ground spindle with carbide anvil ensure durability and accuracy.. Comes in a padded case with adjustment wrench. Features: Includes 6 Micrometers with measuring ranges: 0 - 1", 1 - 2", 2 - 3", 3 - 4", 4 - 5", 5 - 6" Super Hard Carbide Tipped Complete with calibration standards and wrenches Ratchet handle for precise application of force. Lock nut Powder coated baked finish Fitted wood padded case included! Graduations: 0.0001" 6 pc Bore Gages: Telescoping gages are used for determining the true size of holes, slots, and recesses up to 6" (150 mm). The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. The final hole size is obtained by measuring over the gage contacts with a micrometer or calipers. Features: Easy to adjust Spherical measuring faces hardened Satin chrome finish Range: 5/16" - 6" (8mm - 150mm) Case included Heavy Duty Micrometer Stand
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PanaVise 391 Micrometer Stand
List Price: $49.99
Sale Price: Too low to display
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PanaVise is a major manufacture of Vises and Work Holding Tools. PanaVise's Tilt, Turn & Rotate technology has been applied to the product line, allowing for maximum efficiency and many different uses! All PanaVise Products are covered by a Limited Lifetime Warranty! Introducing the Panavise 391 MICROMETER STAND, Position your micrometer EXACTLY where you need it! A convenient combination, perfect for the workbench. Gently, yet firmly, holds micrometers of all sizes. Can also hold small PC boards and other objects. Delrin pads open 0.5-Inch (12.7mm) and close to zero for holding thin items. Throat depth: 0.95 (24.1mm). Single control knob and exclusive split-ball locks Head firmly in place. Base accepts all 300 series vise Heads. Base features 4.3125 (109.5mm) bolt circle countersunk for three 1/4 (6.3mm) flat-head screws (not included). Limited Lifetime Warranty!
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X-Y Micrometer Measuring Stand
Sale Price: $4,495.00
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Flexbar X-Y Micrometer Measuring Stand with 1" x 1" travel stage and 2 ea. 0-1" Digital Micrometer Heads.
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Micrometer Stand
Sale Price: $28.50
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Micrometer Stand. With Swivel Positioner. Locks after adjustment to any convenient Angle. Leaves both hands free saving time and eliminating fatigue during inspection. Fine durable Finish.
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