Rating history: Lenses principle,Lens and focal point,Lens adjustment

Answer:
Lens is made of any transperent material having two part of two spheres. Lens are two types : 1. convex () and 2. Concave )(. Lens principle - 1. Incident ray, refrected ray and normal are in same plane . 2. R= 2f. Lens formula- 1/f=1/v+1/u.

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