False. You can have total internal reflection where the effective angle is greater than 90 deg
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Angle of refraction will be less compared to the angle of incidence in this case.
An acute angle
an acute angle, which is an angle less then 90
The degree of an acute angle is just less then 90 ( because it would be a right angle if it was 90). So that means it could just be a 5 degree acute angle and a 10 degree acute angle so that would only add up to 15 degrees, obviously not making it an obtuse angle.
If you meant optical density by the term 'denser ' Then the answer is.... The light bends towards normal when it travels from a optically less dense medium to optically dense medium. So angle of incidence is greater than the angle of refraction