Questions in Ray Optics and Optical Instruments

Select	Question
	A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm) in a sheet of paper. The reason will be
	For a normal eye, the least distance of distinct vision is
	For the myopic eye, the defect is cured by
	A person suffering from hypermetropia requires which type of spectacle lenses
	Substance on the choroid is
	Astigmatism (for a human eye) can be removed by using
	Circular part in the centre of retina is called
	Image formed on the retina is
	If there had been one eye of the man, then
	A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm