If we have 3 resistors in a series, with resistor 1 having a resistance of 5, resistor 2 having a resistance of 10, and resistor 3 having a resistance of 15, what is the equivalent resistance of the series?

a) 40 Ω
b) 20 Ω
c) 30 Ω
d) 10 Ω

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

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myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.