Question

Three rules to draw ray diagrams of images obtained by convex lenses

Answer 1

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To draw these ray diagrams, we will have to recall this three rules of refraction for a double convex lens:

1) Any incident ray travelling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens.

2) Any incident ray traveling through the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis.

3) An incident ray that passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.


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Answer 2

Answer:

Explanation:(1) When a ray of light strikes the convex or concave lens obliquely at it's optical centre,it continues to follow it's path without any deviation

(2) When rays parallel to the principal axis strikes a convex or concave lens,the refracted rays are converged to (convex lens) or appear to diverge from (concave lens) the principal focus (3) When a ray passing through (convex lens) or directed towards (concave lens) the principal focus strikes a convex or concave lens,the refracted ray will be parallel to the principal axis