Problem 4: Oscar has an old-fashioned lantern projector that uses a candle and a lens to project a slide onto the wall. The lens is 1.3 cm from the slide and projects an image onto a screen 80 cm away. Oscar adds a lens to the original lens to allow him to project an image onto a screen 30 cm away. a. What is the power of the original lens? b. What is the desired power of the combined lenses? c. What power lens must Oscar add?

Problem 4: Oscar has an old-fashioned lantern projector that uses a candle and a lens to project a slide onto the wall. The lens is 1.3 cm from the slide and projects an image onto a screen 80 cm away. Oscar adds a lens to the original lens to allow him to project an image onto a screen 30 cm away. a. What is the power of the original lens? b. What is the desired power of the combined lenses? c. What power lens must Oscar add?