IMAGE. An absorption spectrum with absorptions at 460 - 470 nm,
550 - 556 nm, 557 - 559 nm, and 605 - 610 nm.
An absoprtion spectrum may be difficult to observe with a hand-held spectroscope. Look for regions of the continuous spectrum where the intensity of the light is weaker. The absorption regions may be completely black (no light at the observed frequencies is passing throught the sample), but are more likely to be only slightly dimmer that the rest of the spectrum. Moving the sample in and out of the path between the light source and the slit will sometimes make the darker regions more obvious (since any change in the spectrum might be noticed).
