objective prism
noun
Definition of objective prism
: a transparent prism of small apex angle but large size that is placed in front of the objective of a telescope to cause all stars and other objects to appear as short spectra in the focal plane where they may be photographed together on a single plate of the field
Explore Merriam-Webster
There's more!
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up objective prism? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!