A. Ciliary muscles
B. Pupil
C. Iris
D. Retina

Correct Answer: Option C

C. Iris

Explanation

Iris is similar to a diaphragm.

SEE ALSO  If the frequency of the tuning fork at resonance is 256Hz, calculate the frequency of vibration of the wire when the tension in the wire is increased to 196N

Copyright warnings! Do not copy.