anyone plz fastly answer these questions
Answers
Explanation:
Q.10
(I) Center of the spherical mirror is called Pole.
The point where the principal axis passes through the mirror is called the pole of the mirror.
(II) Twice of Focal length is called as Radius of Curvature i.e distance between Pole and Center of Curvature is called as the Radius of Curvature.
(III) Distance between Pole and the Principal Focus is called Focal Length.
(IV) Rays of light parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature is Called as Principal Focus of Mirror.
Q.11
1st law = the velocity of a body remains constant unless the body is acted upon by an external force.
eg - a book kept in the table remains there forever unless an external force acts upon it.
2nd law = rate of change of momentum is directly proportional to external unbalanced force and the change in momentum takes place in the same direction of force.
eg - If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.
3rd law = for every action (force) there is an equal and opposite reaction (force).
eg - a swimmer pushes water backwards (action) . the water pushes him forward (reaction).
Only five points it's not fare.
