Question

An object of size 7cm is placed at 27cm in front of concave mirror of focal length 18cm.At what distance from the mirror should be placed. find the nature and size of image​

Answer 1

The head of the comet and the beginning of its long tail are shown. ... Comets are icy bodies in space that release gas or dust. They are often compared to dirty snowballs, though recent research has led some scientists to call them snowy dirtballs. Comets contain dust, ice, carbon dioxide, ammonia, methane and more.