Recent content by sofianets

Homework Statement A 5cm mirror is just large enough to show the whole image of a tree when held 20 cm from the eye of the observer whose distance to the tree is 100 m. What is the height of tree? Homework Equations n/a The Attempt at a Solution n/a

yes,it can be 2.10^8 m/s

Homework Statement if the velocity of light in the medium is assumed to be 2.10^-8 m/s, how much time does it take the light to travel through the distance of 60 cm? Homework Equations n/a The Attempt at a Solution i tried to do something but not enough.. :(