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Answers
1. Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.
2 we know that f=R/2
so,f=20/2
= 10cm
3 concave mirror
4. The radius of curvature, R= 32 cm
The radius of curvature, R= 32 cmRadius of curvature = 2 — Focal length (f)
The radius of curvature, R= 32 cmRadius of curvature = 2 — Focal length (f)R= 2f=
The radius of curvature, R= 32 cmRadius of curvature = 2 — Focal length (f)R= 2f=f = R/2 = 32/2 = 16
The radius of curvature, R= 32 cmRadius of curvature = 2 — Focal length (f)R= 2f=f = R/2 = 32/2 = 16Hence, the focal length of the given convex mirror is 16 cm.