ABO OPTICAL EXAM 2023 WITH COMPLETE ANSWERS

Light falling on the front surface of a spectacle lens is: A) partially reflected, partially absorbed and the remainder refracted B) partially reflected and the remainder refracted C) partially absorbed and the remainder refracted D) totally refracted correct answersA) partially reflected, partially absorbed and the remainder refracted Concave mirror: A) can focus parallel incident rays to form a real image B) can focus parallel incident Rays to form a virtual image C) always produce inverted images of real objects D) produces virtual images smaller than the real object. correct answersA) can focus parallel incident rays to form a real image Reflection is reduced by depositing a layer of magnesium fluoride on the lens surface. It has a thickness of: A) 1/2 the wave length of white light B) 1/4 the wave length of white light C) 1/2 the wave length of blue-violet light D) the wave length of yellow light correct answersD) the wave length of yellow light