Question of optics see image Share with your friends Share 0 Bakul Biswas answered this Dear Student, given,f=10 cm u=-15 cmwe know,1v-1u=1f⇒1v=1f+1u⇒1v=110-115⇒v=30 cmthe refracted rays from lens should fall normally on the mirror for the image to coincide with the object.d+20=v=30 cmd=30-20cm=10cm Regards -1 View Full Answer