A spherical mirror and a thin lens both have a focal length $(f)$ of $- 15 cm$ . The mirror and lens used were both [[1]].

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Detailed Solution

A spherical mirror and a thin lens both have a focal length

(f)

- 15 cm

. The mirror and lens used were concave.
The focal length is the distance between the lens and the focal point. Converging lenses always have positive focal lengths, whereas diverging lenses always have negative focal lengths. The negative focal length is provided by the concave mirror and concave lens. When a hollow sphere is cut into parts, and the outer surface of each cut part is painted, it becomes a mirror, with the inner surface reflecting. A concave mirror is a name given to this type of mirror. A concave lens diverges a straight light beam from the source to produce a diminished, upright virtual image.

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