Question

question 11
a ________ uses a photographic plate in place of the objective lens of a telescope.
spectroscope
spectrograph
refracting telescope
reflecting telescope
question 12
________ is the temperature at which a object begins to glow with its own light.
dispersion
refraction
incandescence
composition

Explanation:

For Question 11, a spectrograph uses a photographic plate in place of the objective lens of a telescope to record spectra. A spectroscope is for viewing spectra, and refracting/reflecting telescopes use lenses or mirrors respectively as objectives.
For Question 12, incandescence is the state of emitting light due to high - temperature. Dispersion is about separating light into its component colors, refraction is the bending of light as it passes through a medium, and composition refers to the makeup of a substance.

Answer:

Question 11: B. spectrograph
Question 12: C. Incandescence