Question

how are reflecting telescopes similar to devices that produce laser light?
both use crystals to produce a beam of light.
both have convex lenses that magnify objects.
both have concave lenses that magnify objects.
both use mirrors to reflect a beam of light.

Explanation:

Reflecting telescopes use mirrors to reflect light to form an image. Lasers can use mirrors in their optical cavities to reflect light and amplify it. Crystals are not a common feature for both in light - production. Reflecting telescopes don't use convex or concave lenses for the main light - gathering and reflecting function as described in the wrong options.

Answer:

Both use mirrors to reflect a beam of light.