The following examples use the Orders table to show how the positive and negative unary operators function. When a positive unary operator is set against a negative value, the returned value is negative (positive_value * negative_value = negative_value). When a negative unary operator is set against a negative value, the returned value is positive (negative_value * negative_value = positive_value). Copy. SELECT (DATEPART(day, Order Date) - DATEPART(day, Shipped Date)) FROM Orders WHERE OrderID = '10248' -- Without a unary operator, the value returned is '-12'.
Inmersion oil does not increase magnification. Inmersion oil is needed at high magnifications. Why? High magnifications come with high numerical appertures (although one can have a low-magnification high-numerical apperture objective). High numerical appertures are required to capture more light and improve resolution.
1) lower stage. 2) remove and clean slide with ethanol and kimwipes if oil was used. Place in slide box. 3) Scanning objective (shortie) facing stage. 4) clean oil off the oil immersion objective (100x) with Lens paper and ethanol. 5) clean the 40x objective as well, just incase it got oil on it.