What type of lens is thicker at the centre than at the edges?

What is the process by which a solid changes directly into a gas without passing through the liquid phase?

Which colour of visible light has the longest wavelength?

Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

Which colour of visible light has the shortest wavelength?

What is the SI unit of frequency?

What is the formula for kinetic energy?

Which law of thermodynamics states that heat naturally flows from a hotter body to a cooler body?

What is the formula for gravitational potential energy?

Which law of thermodynamics states that energy cannot be created or destroyed only converted from one form to another?

Which scientist formulated the law of universal gravitation?