The change in speed is the cause and the change in direction (refraction) is the effect. Flickr Physics Photo Laser light shown passing through a rectangular block of lucite. It enters the block along the normal line with an angle of incidence of 0Â°. There is no bending upon entering, nor upon leaving the block.
There are 237 calories in 1 cup of Refried Beans (Canned). Calorie breakdown: 12% fat, 67% carbs, 21% protein.
1 Â½ cup of cooked green beans: 3 grams of effective (net) carbohydrate plus 2 grams of fiber and 22 calories.  Â¼ lb (4 oz) of raw green beans: 4 grams of effective (net) carbohydrate plus 2 grams of fiber and 35 calories.