A flat luminaire with dimensions 1.2 x 0.2m is mounted in a ceiling. The luminaire has an opal plastic plate at the bottom and can be considered ideally diffuse. On a wall in the room is placed a picture with dimensions 0.4m x 0.4m, as shown on the figure. The goals apply from the midpoints of resp. luminaire and picture. 2 m Armatur 1 m image The light flux of the light sources is 6200 Im. The brightness normally from the bottom of the luminaire is 1400cd. 1.1 Determine the flux of light from the luminaire. Determine the efficiency of the luminaire. Use the vector method to determine the average illuminance as the luminaire gives in the picture. [Number answer: 108 lux]

Calculate the critical angle for the light traveling from glass (n glass= 1.54) to air (n=1.00). Express your answer in degrees. Normal format with 3 SF. air

6. A sheet of glass has an index of refraction nalass = 1.45. Assume that the index of refraction for air is na= 1.00, Light is incident on the sheet of glass at an angle of incidence of 60°, as shown in the figure below. a. Calculate and label the size of each angle (in degrees) on the figure, including angles of incidence and refraction at each of the two parallel surfaces shown. 60 degrees Air na = 1.00 Glass " = 1.45 Air ng = 1.00 b. Calculate the velocity of the light as it travels in the glass.

A 45°-90°-45° prism is constructed from a synthetic resin. As shown in the figure, a light beam that enters the prism at the midpoint of the long side and parallel to the base exits the prism at an angle of 33° below the horizontal. What is the index of refraction of this prism? Additional Materials