An object is placed 21cm from a concave mirror of curvature 10cm. A glass slab of thickness 3cm and R.I. 3/2 is then placed b/w the object and mirror. Find the position of final image formed.(The distance of near surface from the mirror to be 1cm)
(1) 5.67 cm. (2)6.67cm
(3) 7.67cm. (4) 8.67cm
