objective prism


noun Astronomy.

a large prism placed in front of the objective lens or mirror of a telescope, allowing the simultaneous acquisition of the spectra of many stars.

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IS YOUR DESERT PLANT KNOWLEDGE SUCCULENT OR DRIED UP?

Cactus aficionados, don't get left in the dust with this quiz on desert plants. Find out if you have the knowledge to survive this prickly foray into the desert!
Question 1 of 7
This tall, horizontally branched cactus is probably the most recognizable cactus in Arizona. What is it called?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020