Primary focus of the concave lens lies on the left side of the optical centre of the lens.

False

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What will happen if a ray of light is incident on concave lens at its first focus instead of second focus?(First focus according to me situated to the left of optical centre of concave lens.)

Q. (a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.
(b) State whether concave lens has a real focus or a virtual focus.
(c) List some things that concave lens and concave mirror have in common.

(a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram.
(b) State whether the convex lens has a real focus or a virtual focus. (c) List some things that convex lens and concave mirror have in common.

Q. Complete the ray diagram if

F_{A}

, the primary focus of the concave lens and

F_{B}

the secondary focus of the convex lens are lying at the same point.

Q. Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed:
(i) Between optical centre and principal focus of a convex lens
(ii) Anywhere in front of a concave lens
(iii) At 2F of a convex lens.

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