Delano E. Lewis, a vice-president and director of the Chesapeake and Potomac Telephone Co., says of the growth of political power among blacks since 1968 that "some of the frustrations that people felt were expressed in the political process."

And overall, he says, "things have gotten better in terms of black participation." But he adds that there remains "some undercurrent of strong racial feelings on both sides."

There is, in particular, an "undercurrent of hostility among the downtrodden blacks toward more affluent blacks and whites," notes Lewis, who has enjoyed undisputed success in the business world. "Some may blame the black politicans and the white power structure."

One of the major changes during the past 15 years, Lewis says, is the way that the white-dominated business community has learned to get along with the new black political power structure.

"Business people are pragmatic," he explained. "They look at what it takes to stay in business . . . and they look at accommodations. The two worlds have accommodated each other."

Lewis believes that the reason there still are few blacks in the business community is because of discrimination and because "we have tended to be a helping people, and we have not tended to be interested in the business world."

But that is changing, he says, "and we are begining to create a group that is interested in these things. But it will take time before that passes down from generation to generation."