Questions in Ray Optics and Optical Instruments

Select	Question
	An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is
	Match the List I with the List II from the combinations shown
	Near and far points of a human eye are
	Two parallel pillars are 11 km away from an observer. The minimum distance between the pillars so that they can be seen separately will be
	Retina of eye acts like ........ of camera
	The hyper-metropia is a
	Amount of light entering into the camera depends upon
	A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length
	A person uses spectacles of power $+2D$. He is suffering from
	To remove myopia (short sightedness) a lens of power 0.66 D is required. The distant point of the eye is approximately