define principal axise , optical sentance, focus, focal lense
Answers
Answer:
Principal axis---
A line passing through the centre of curvature and focus is called principal of Axis.The focus is the point on principal Axis where are all the rays of light ,parallel to principal Axis convert after reflection from lens.
It is denoted by 'P'
Focal length ----
It is the distance between the focal point and the pole of the lens. The focal length of a lens is always found to be half of the radius of the curvature .The focus is the point on principle axis where all the light rays parallel Axis converge after being reflected from the lens.
It is denoted by 'f'
Explanation:
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Answer:
pehele mujhe brianlist mark karo follow. karo
majak hai
jab koi line parallel jata hai hai principal axis hai to wo cut krtaa hai principal axis usi point ko focus kahte hai and the distance from focus to optical center is called focal length