Answer:

Explanation:
From the question we are told that:
Far point 
Refractive power 
Generally, the equation for Focal length is mathematically given by



Therefore

Where



Therefore,The between her glasses and eyes



Answer:
more speed means that an object has more energy, now if an object's place is something such as a hill, the potential energy will increase meaning an object will have more speed and acceleration. this is because you have the earth's gravity helping you out when the object goes downhill, giving it the higher potential energy
Most planets have ATMOSPHERE but none has a HYDROSPHERE like Earth has.
Answer:
So length of pendulum is 143.129 m
Explanation:
We have given period of simple pendulum is 2 sec
We have to find the length of simple pendulum
Let the length of pendulum is l
Acceleration due to gravity
is
Time period is given by 
So 

Squaring both side

l =143.129 m
So length of pendulum is 143.129 m