Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed towards the principal focus of a convex mirror.Mark on it the angle of incidence and the angle of reflection. ( CBSE 2014)

A 6 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 15 cm. The distance of the object from the lens is 10 cm. Find the position, size and nature of the image formed, using the lens formula. ( CBSE 2013, 2012)

(a) Define optical center of a spherical lens.(b) A divergent lens has a focal length of 20 cm. At what distance should an. object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of the image also.(c) Draw a ray diagram to show the formation of image in above situation. ( CBSE 2016, 2012)

The image of an object formed by a mirror is real, inverted and is of magnification -1. H the image is at a distance of 40 cm from the mirror, where is the object placed? Where would the image be if the object is moved 20 cm towards the mirror? State reason and also draw ray diagram for the new position of the object to justify your answer. ( CBSE 2016)

The image of an object formed by a lens is of magnification -1. If the distance between the object and its image is 60 cm, what is the focal length of the lens? If the object is moved 20 cm towards the lens, where would the image be formed? State reason and also draw a ray diagram in support of your answer. (CBSE 2016)