 clear sure Lens formula is 1 upon f is equal to 1 upon v minus 1 upon u if I put the value I get 1 upon negative 10 negative 10 converging lens is con vex, so it will be positive clear is equals to 1 upon V we do not know minus 1 upon u which is negative 25 Goes this side 1 upon V equal to 1 upon 10 minus 1 upon 25 50 be the LCN 2 5 50 by 3 will be the position of the Image clear sure fine Clear now draw the ray diagram and find the position size and nature of the Image found so ray diagram is your responsibility. Okay, what are