QUES: Machine vision systems often require bright and homogeneous illumination, so features of interest are easier to process. LEDs are often used for this purpose, and this is likely to remain one of their major uses until the price drops low enough to make signaling and illumination uses more widespread. Barcode scanners are the most common example of machine vision, and many low cost products use red LEDs instead of lasers. Optical computer mice are an example of LEDs in machine vision, as it is used to provide an even light source on the surface for the miniature camera within the mouse. LEDs constitute a nearly ideal light source for machine vision systems for several reasons:

Why are LEDs preferred for machine vision systems?
What is the answer?
ANS: so features of interest are easier to process
QUES: There are several sources of the seedlessness trait, and essentially all commercial cultivators get it from one of three sources: Thompson Seedless, Russian Seedless, and Black Monukka, all being cultivars of Vitis vinifera. There are currently more than a dozen varieties of seedless grapes. Several, such as Einset Seedless, Benjamin Gunnels's Prime seedless grapes, Reliance, and Venus, have been specifically cultivated for hardiness and quality in the relatively cold climates of northeastern United States and southern Ontario.

How many varieties of seedless grapes are there?
What is the answer?
ANS: more than a dozen
QUES: The establishment of the Santa Hermandad in 1480, and of the Real Audiencia del Reino de Galicia in 1500a tribunal and executive body directed by the Governor-Captain General as a direct representative of the Kingimplied initially the submission of the Kingdom to the Crown, after a century of unrest and fiscal insubordination. As a result, from 1480 to 1520 the Kingdom of Galicia contributed more than 10% of the total earnings of the Crown of Castille, including the Americas, well over its economic relevance. Like the rest of Spain, the 16th century was marked by population growth up to 1580, when the simultaneous wars with the Netherlands, France and England hampered Galicia's Atlantic commerce, which consisted mostly in the exportation of sardines, wood, and some cattle and wine.

In spite of these wars, which exports did Galicia's Atlantic trade consist of?
What is the answer?
ANS:
sardines, wood, and some cattle and wine