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Answers
Answer:
(1)=When an object is placed between theprincipal focus and optical centre of a convex lens, then a parallel ray of light AO passes through the focus after refraction along the direction OX. ... The image A'B' formed in this case is a Virtual image which is formed on the same side of the lensbehind the object.
(2)=Focal length is the distance between the principal focus and optical centre of the lens.
Principal focus is the imaginary line passing through the optical centre of the lens.

(3)=The effective diameter of the circular outline of a spherical lens is called its aperture. A lens has two principal foci F1 and F2. Focal Length: The distance of the principal focus from the optical centre of alens is called its focal length. The letter f is used to represent the focal length.
(4)=The focal length is a spherical lens is option a m the distance between optical centre and principal focus of the lens be the distance between centre of curvature and optical centre of the lens should see the diameter of the outline lens the radius of the outline of spherical lens
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Explanation:
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Answer:
(A) The distance between optical centre and pricipal focus of lens