Experiment 7 — Correct the Vision

Topic: Physics · Class 10 · The human eye: defects of vision and their correction

Aim: Correct the patient’s myopia so that distant objects focus on the retina.

Daily: Roughly one in three Indian teenagers now needs glasses for distance. The prescription your optician writes is a lens power in dioptres, calculated exactly like this.

Question: Myopia is corrected using which lens?

Exp: A diverging lens moves the focus back onto the retina.

Question: In myopia, distant objects focus…

Exp: The eyeball is too long or the lens too strong.

Question: A patient’s far point is 1 m. The required lens power is…

Question: The ability of the eye lens to change focal length is…

Exp: Carried out by the ciliary muscles.

Question: The sky is blue because air molecules…

Exp: Shorter wavelengths scatter more.