FINDING FOCAL LENGTH OF A CONVEX LENS

A convex lens of focal length f cut into parts first horizontally and then vertically. Find the focal length of part A of the lens, as shown:

Match the items given in A, B, C and D against. their corresponding description given in 1, 2, 3, 4 and 5. A. Astronomical telescope B. Galilean Telescope C. Simple Microscope D. Compound Microscope 1. contains one convex lens 2. contains one concave lens 3. contains a convex lens of large focal length in the objective and a convex lens of small focal length in the eye-piece 4. contains a convex lens of small focal length in the objective and a convex lens of large focal length in the eye-piece 5. contains a convex lens of large focal length in the objective and a concave lens of small focal length in the eye-piece

Two convex lenses of equal focal lengths are kept in contact with each other. If the power of their combination is 10D , find the focal length of each convex lens.

Two convex lenses of equal focal lengths are kept in contact with each other. If the power of their combination is 20 D, find the focal length of each convex lens.

Two convex lenses of equal focal lengths are kept in contact with each other. If the power of their combination is 20 D, find the focal length of each convex lens.

Find the focal length of a convex lens which produces a virtual image at 10 cm from the lens when an object is placed at 5 cm from the lens.

Find the focal length of a convex lens which produces a real image at 60 cm from the lens when an object is placed at 40 cm in front of the lens.

Find the focal length of a plance-convex lens with R_(1) = 15cm and R_(2) = oo . The refractive index of the lens material n = 1.5