it will become 45 degree
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The angle of incidence equals the angle of reflection. Therefore, if your angle of incidence is 15 degrees, your angle of reflection equals that also. If it is 45 degrees, your angle of reflection is also 45 degrees, and so on.
Not usually. (Only when the angle is 45 degrees.)"The angle of incidence is equal to the angle of reflection."
The law of reflection: When a ray of light reflects off a mirror, the angle of the incidence ray is equal to the angle of the reflection ray. Therefore, an incidence ray of 45 degrees will have a reflection ray of 45 degrees. As both rays are equal, either side of the normal line, then adding both angles equals 45 + 45 = 90 degrees. The normal line is a line perpendicular to the surface of the mirror.
The angle of reflection is 140/2 = 70 degrees. The angle of reflection is the same as the the same as the incident.
An oblique angle is any angle not 90 degrees or a multiple of 90 degrees. So 45 degrees is an oblique angle. A 45 degree angle is also an acute angle (anything less than 90 degrees).