A motor cyclist observes a car coming from behind with a magnification 1/6. If the actual distance between the car and the bike is 30 m calculate the radius of curvature of the mirror.

A motor cyclist observes a car coming from behind with a magnification 1/6 . If the actual distańce between the car and the bike is 30 m calculate the radius of curvature ofțhe mirror.

A girl standing on a lighthouse built on a cliff near the seashore, observes two boats due East of the lighthouse. The angles of depression of the two boats are 30^@ and 60^@ . The distance between the boats is 300 m:-Find the distance of the top of the lighthouse from the sea level.(Boats and foot of the lighthouse are in a straight line).