Physics · Refraction of light at plane and spherical surfaces, thin lens formula and lens maker formula
In a healthy human eye, the focussing is done by the
In a healthy human eye, the focussing is done by the
- A. To and fro movement of the eye-lens
- B. Changing the curvature of the retina
- C. Change in the convexity of the lens through ciliary tubes
- D. Change in the refractive index of the eye fluid
Step-by-step solution
The human eye focuses by changing the curvature of the lens, which alters its focal length. This is controlled by the ciliary muscles. Option C correctly describes this process as a change in convexity via ciliary structures. Options A, B, and D are incorrect because the lens does not move to and fro, the retina does not change curvature, and the refractive index of the eye fluid remains constant during accommodation.
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