According to the New Cartesian Sign Convention, which one of the following is correct is respect of the formula $\dfrac{1}{f} = \dfrac{1}{v}+ \dfrac{1}{u}$, where symbols have their usual meanings?

Which one of the following statements is not correct for light rays?

A glass prism splits white light into different colours. This phenomenon is called dispersion of light by prism. Which one of the following statements is correct?

A current of 1.0 A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge that flows through the circuit is