The Following Items Are Positioned in Sequence: a Source of a Beam

question 34

Multiple Choice

The following items are positioned in sequence: A source of a beam of natural light of intensity $I _ { 0 }$ , three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer $A$ is set at $0 ^ { \circ }$ (vertical) , and the axis angle of polarizer $C$ is set at $50 ^ { \circ }$ . The axis angle of polarizer $B$ is set at $120 ^ { \circ }$ . What is ratio of the intensity of the beam at the observer to the intensity $I _ { 0 }$ of the source?

• A) \(0.015\)
• B) \(0.035\)
• C) \(0.020\)
• D) \(0.025\)
• E) \(0.030\)

Understand the significance of measuring specific gravity to assess the concentration of substances in urine.

Identify medical conditions associated with changes in urine composition, such as anuria, hematuria, and glycosuria.

Recognize the significance of temperature and time constraints on urine specimen validity.

Understand the protocols for collecting urine specimens for drug and alcohol testing.