Question

when we are inside water the out side objects will appear smaller or longer​

Answer 1

When we are inside water the out side objects will appear $\sf \green{longer}$ because their reflective index is different!!

Answer 2

Since air has an index of refraction of essentially 1 and water has an index of refraction of 1.33 the angle from which the rays of light reach your eyes is larger than the angle they would in air . This makes the angular size larger to your eyes which makes the object look larger relative to how they would look in air .