Indian police have arrested a 24-year-old Youtuber from Arizona who visited an off-limits island in the Indian ocean to try to make contact with an isolated tribe known for attacking intruders.

The Toyota Sienna is a minivan produced by Toyota at the Toyota Motor Indiana factory in the United States. Remarkably, its name took after the Italian city of Siena in the Tuscany area. This Sienna ...

\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.