19. What is the most likely outcome of increasing the number of slits per unit distance on a diffraction grating? a. lines become narrower b. distance between lines increases c. lines become thicker d. distance between lines decreases

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.