Answer:
Option C, The magnetic domains inside the material must be aligned
Explanation:
Magnetic domains determine the magnetic behavior of any substance. Most of the magnetic substances have disoriented magnetic domains due to which they do not behave as magnets until unless an external force is applied to change the orientation of their domains and align them properly.
Hence, option C is correct
Answer:
A) False
B) False
C) True
D) True
E) True
Explanation:
A) At the critical angle, no light is reflected and all light is transmitted: This statement is false because critical angle has nothing to do with whether all light is transmitted.
B) During refraction, the ray that travels through the second medium is called the incident ray: Statement is False because the ray in the second medium is called refracted ray.
C) The angle of refraction is measured from the perpendicular to the boundary between two materials: Statement is true.
D) The speed of light in a medium is always less than the speed of light in a vacuum: Statement is true because speed of light in vacuum is approximately 300,000 km/s and no other light can go higher than that.
E) The virtual image of a pencil in a glass of water is closer to the viewer than the actual pencil: Statement is true.
True, physical excercise helps
