NCERT · Class 10 · Science · The Human Eye and Colourful WorldThe dark muscular diaphragm that controls the size of the pupil is:
Step-by-Step Solution
The iris is a dark muscular diaphragm that controls the size of the pupil. It regulates the amount of light entering the eye by adjusting the aperture size.
Detailed Options Breakdown
Option : Cornea
Incorrect choice. This distractor represents a common misunderstanding of the core principles of The Human Eye and Colourful World.
Option 1: Iris (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 2: Retina
Incorrect choice. This distractor represents a common misunderstanding of the core principles of The Human Eye and Colourful World.
Option 3: Ciliary muscles
Incorrect choice. This distractor represents a common misunderstanding of the core principles of The Human Eye and Colourful World.
💡 Study Guide: This question tests core syllabus concepts from The Human Eye and Colourful World. For formulas, key summaries, and mock exam reference guides, read the full The Human Eye and Colourful World Revision Notes.