Question

Rules of obtaining images by convex lens by diagrams
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Answer 1

Answer:

the image formed by convex lens is always real and inverted

convex lens has two center of curvatures and two radius of curvatures

Answer 2

Rule1. If the incident ray si parallel to principal axis, then the refracted ray     passes through focus (F).

Rule2.If the incident ray passes through the focus, the refracted ray becomes parallel to principal axis.

Rule3. A ray of light passing through the optical centre of lens passes through the lens undeviated.