When you catch the ball you act surprised, action- reaction
Thick lens will have shorter and consequently thin lens will have greater focal length. Because, For a thick lens, the optical path length of the light is more, than for a thin lens, thus, the bending of light will be more in case of a thicker lens. Consequently, it has a shorter focal length.
"The proton and neutron have nothing to do with the isotope little billy"
