A small radiant source A₁ emits diffusely with an intensity I₁ = 1.2 x 10⁵ W/m² ? sr. The radiation detector A₂ is aligned normal to the source at a distance of L_o = 0.2 m. An opaque screen is positioned midway between A₁ and A₂ to prevent radiation from the source reaching the detector. The small surface A_m is a perfectly diffuse mirror that permits radiation emitted from the source to be reflected into the detector.

(a) Calculate the radiant power incident on A_m due to emission from the source A₁, q_1?m (W),

(b) Assuming that the radiant power, q_1?m is perfectly and diffusely reflected, calculate the intensity leaving A_m' 1_m (W/m² ? sr).

(c) Calculate the radiant power incident on A₂ due to the reflected radiation leaving A_m, q_1?m (?W).

(d) Plot the radiant power q_m?2 as a function of the lateral separation distance y_o for the range 0 y_o 0.2 m. Explain the features of the resulting curve.

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Opaque screen %, - 0.1 m- Az = A, A,= 2A A, = 1 x 10 m? L,- 0.2 m -0.1 m