Related InterviewSolutions

• The size of an object as perceived by an eye depends primarily on(a) actual size of the object(b) distance of the object from the eye(c) aperture of the pupil(d) size of the image formed on the retina.
• The muscles of a normal eye are least strained when the eye is focused on an object(a) far away from the eye(b) very close to the eye(c) at about 25 cm from the eye(d) at about 1 m from the eye.
• Mark the correct options.(a) If the far point goes ahead, the power of the divergent lens should be reduced.(b) If the near point goes ahead, the power of the convergent lens should be reduced.(c) If the far point is 1 m away from the eye, divergent lens should be used.(d) If the near point is 1 m away from the eye, divergent lens should be used.
• The focal length of the objective of a compound microscope is fo and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument,(a) L < u(b) L > u(c) fo < L < 2fo(d) L > 2fo.
• A normal eye is not able to see objects closer than 25 cm because(a) the focal length of the eye is 25 cm(b) the distance , of the retina from the eye-lens is 25 cm(c) the eye is not able to decrease the distance between the eye-lens and the retina beyond a limit(d) the eye is not able to decrease the focal length beyond a limit.
• To increase the angular magnification of a simple microscope, one should increase(a) the focal length of the lens(b) the power of the lens(c) the aperture of the lens(d) the object size.
• An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends(a) on f but not on u(b) on u but not on f(c) on f as well as u(d) neither on f nor on u.