Why do plane mirrors and convex mirrors form only virtual images?

a) because they cannot make light rays converge
b) because they cannot make light rays converge
c) because they both show a wide angle of view
d) because they only reflect light

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.