Final answer:
With a lesion of the left oculomotor nerve, shining light in the left eye will not cause the left pupil to constrict properly due to the disruption of the direct reflex, but the right pupil should still constrict due to the consensual reflex.
Step-by-step explanation:
When a lesion occurs on the left oculomotor nerve and light is shone into the left eye, the pupillary light reflex will be affected. Normally, shining light in one eye should cause both pupils to contract due to the efferent limb of the reflex being bilateral. In this scenario, if the left oculomotor nerve is damaged, shining light in the left eye will result in the loss of the direct reflex. Therefore, the left pupil will not constrict properly, but the consensual reflex should still cause the right pupil to constrict despite the lesion.