(a) Complete the path through the two prisms of the ray shown leaving a. (b) The light of wavelength 710 nm travels from P to A. If object PQ is in air, then calculate the wavelength and speed of light in the prism of index 1.5. (c) Explain why the ray AB reflects through 90° at B and does not pass out of the prism at B.

(a) Complete the path through the two prisms of the ray shown leaving a. (b) The light of wavelength 710 nm travels from P to A. If object PQ is in air, then calculate the wavelength and speed of light in the prism of index 1.5. (c) Explain why the ray AB reflects through 90° at B and does not pass out of the prism at B.