Part a is done please do part b, c and d

17. In an optical measurement of a crystal attenuation and time delay to light ray, the following apparatus are given: a laser, a chopper, a chopper controller, a semi-transparent mirror, a light detector, and a lock-in amplifier. An optical chopper is a device which periodically interrupts a light beam by rotating a disc as shown in the figure. Answer the following questions: (5 Marks Each) Lock-in Amp Light Chopper ) Input Reference (a) Sketch the diagram of the experimental setup with clear indication of each component and correct connection of input and reference to the lock-in amplifier. (b) The light detector is a light sensitive transistor as shown in the figure. Sketch the setup to detect light by measuring voltage which is proportional to light power. A 5V voltage supply, a resistor can be used. Light-sensitive transistor (c) Explain how to measure the light attenuation and induced phase delay in the crystals. (d) If the lock-in output voltage as a function of phase angle of the reference is shown in the figure, what phase delay (in angle) is induced by the crystal? 5 200 Output voltage (mV) 2 & o 15 20 25 Phase different(degree)