Quiz: Test Your Knowledge of Stress and Anxiety. Stress and anxiety are the same thing. You answered: Correct Answer: Stress is your response to a change in your environment, be it positive or negative. Your body reacts to change -- falling in love, starting a new job, or suffering an unexpected loss -- with physical, mental, and emotional responses. Anxiety is an emotion thatâs characterized by a feeling of apprehension, nervousness, or fear. The causes of stress are essentially the same for everyone.
Alternate methods of direct arthrography examinations may also use magnetic resonance imaging (MRI) or computed tomography (CT) following contrast material injection into the joint. An x-ray (radiograph) is a noninvasive medical test that helps physicians diagnose and treat medical conditions. Direct arthrography is particularly effective for detecting disease of the structures within the joints such as ligaments, tendons and cartilage. 2  This is particularly true for the shoulder in the setting of shoulder dislocation and in the hip, wrist and elbow.
An achromat doublet does not completely eliminate chromatic aberration, but can eliminate it for two colors, say red and blue. The idea is to use a lens pair with the strongest lens of low dispersion coupled with a weaker one of high dispersion calculated to match the focal lengths for two chosen wavelengths.hromatic Aberration. A lens will not focus different colors in exactly the same place because the focal length depends on refraction and the index of refraction for blue light (short wavelengths) is larger than that of red light (long wavelengths).