Length of the study table is 80 cm and length of the bench is 1.5m.Length of the study table is more than bench. Is it true or false?
An optical bench, to measure the focal length of lens, is 1.5m long and on the bench marks are with spacing 14cm. Now a lens is placed at 75cm and pin type object is placed at 45cm marks on the bench. If its image is formed at 135cm find maximum possible error in calculation of focal length.