[[1]] is the type of mirror that is used in cars and solar furnaces.

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Detailed Solution

Concept: To address this topic, we will first describe the concave and convex mirrors, and then we will try to determine which mirror is utilized in a solar furnace based on its properties.
A converging mirror, also known as a concave mirror, has a reflecting surface that is depressed inward (away from the glare of the incident). Concave mirrors reflect light inwards from a single focal point.
A convex mirror is a curved mirror with the reflecting surface protruding into the light source. This coating is designed to reflect light rather than absorb it.
Using a concave mirror is common in solar furnaces. The sun furnace is effectively retained at the focal point of the large concave reflector. The concave reflector directs the Sun's heat beams onto the furnace, allowing it to reach its maximum temperature.
Hence, the correct answer is Concave mirror.

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