Explain the following terms related to special lens.
a) Centre of curvature
b) radius of curvature
c) principal axis
d) optical centre
e) principal focus
Answers
Answer:
ANSWER 1. is Centre of curvature is defined as the center of the surface of sphere of which the lens is a part. Since, a lens has two surfaces, so the lens has two centers of curvatures.
ANSWER 2. is Radius of curvature of a path at a point is a circle to which the curve of the path touches the circle tangentially. It tells us how much the curve is at this point. Less the radius of curvature, more pointed is the curve at the given point.
ANSWER 3. is Principal axis is defined as the straight lines passing through center of curvature.
ANSWER 4. is Optical center is defined as the point on the lens which is on the principal axis and the light ray doesn't deflect when passes through it.
ANSWER 5. is Principal focus is defined as the point where beam of light parallel to principal axis, either converges or diverges after refraction.
Explanation:
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