ABO OPTICAL EXAM questions with correct 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 - Answer A) 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. - Answer A) 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 - Answer D) the wave length of yellow light White light is broken into its components colors when it