Blog categorized as Ray Optics

Q- The minimum focal length of an eye lens is f = 2.8 cm and the distance between the lens and retina = 3.00 cm. Find the focal length of the lens to read a book at a distance of 25 cm from eye-lens. 

Solution:

An object is midway between a biconcave lens (with focal length 15 cm) and a concave mirror (with radius of curvature 20 cm). The mirror-lens distance is 25 cm. Considering only the light that leaves the object and travels first toward the mirror, locate the final image formed by this system. Is thi...

Q- A compound microscope is used to enlarge an object kept at a distance 0.03m from it’s objective which consists of four thin convex lenses in contact and has focal length 0.02m. If a lens of focal length 0.1m is removed from the objective, then by what distance the eye-piece of the microscope must...