True or False : 0°K=-273.15° C and 0°C (Celsius) = 273.150K

What are similarities and differences of reflection, refraction, diffraction and absorption?

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.