A thick lens presents two concave surfaces, each of radius 5 cm, to incident light. The lens is 1 cm thick and has a refrac- tive index of 1.50. Find (a) the system matrix for the lens when used in air and (b) its cardinal points. Do a ray dia- gram for some object.

Problem 13:  Assume the lens-to-retina distance of the human eye is 2.00 cm. Calculate the power P, in diopters, of the eye when viewing an object 4.5 m away.

A thin plastic lens with index of refraction n = 1.69 has radii of curvature given by R, = -11.5 cm and R, = 30.0 cm. HINT (a) Determine the focal length in cm of the lens. cm (b) Determine whether the lens is converging or diverging. O converging O diverging Determine the image distances in cm for object distances of infinity, 7.00 cm, and 70.0 cm. (c) infinity cm (d) 7.00 cm cm (e) 70.0 cm cm

A student stands dsub0=2.4 m in front of a floor-to-ceiling mirror. Her eyes are hsube=1.53 m above the floor and she holds a flashlight at a distance hsubf=.55 m above the floor. Calculate the angle in degrees that the flashlight makes with respect to the floor if the light is reflected into her eyes.