The diagram in figure shows experimental setup for determination of the focal length of a lens using a plane mirror.

(i) Draw two rays from the point O of the object to show the formation of image I at O itself.

(ii) What is the size of the image I?

(iii) State two more characteristics of the image I.

(iv) Name the distance of the object O from the optical centre of the lens.

(v) To what point will the rays return if the mirror is moved away from the lens by a distance equal to the focal length of the lens?

(i) Below ray diagram shows the formation of image I at O itself:

(ii) The size of the image is same as that of the object O.

(iii) The image I is inverted and real.

(iv) The distance of object O from the optical centre of the lens will be equal to the focal length of the lens.

(v) The position of plane mirror relative to the lens does not affect the position of image as long as rays fall normally on the plane mirror M.