If a vector is equal to 3 ICAP - j cap + 2 k cap and b vactor equal to check app minus k cap then show that the vectors a + b and a minus b are perpendicular
An object is placed at a distance of 60 cm from a concave lens focal length 30 (i) find the distance of the image from the lens .(ii) least four characteristics of the image . ( iii ) drow a ray diagram.