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Answer:
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Explanation:
concave lens :-a type of lens that diverges a straight light beam coming from the source to a diminished, upright, virtual image is known as a concave lens.
concave mirror :-A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex or concave. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
Erect image :-An erect image is one that appears right-side up. It is an image in which directions are the same as those in the object.
Rainbow :-A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.