If focal length is less then the lens would : be thick be thin have plane sides none of these. Two lens of focal length +2D and -4D are combined. The combination of these two lens would behave as: Converging lens Diverging lens The total focal; length will be zero. None of these. The refractive index of a medium is v3[root three]. What would be the polarising angle for this medium. 60 degrees 30 degrees 45 degree 90 degree. The aberration [error] which occurs due to shape of lens is: chromatic aberration astigmatism aberration spherical aberration none of these. The aberration which occurs due to splitting of a white light when it is passed through a lens is: Astigmatism Chromatic aberration Spherical aberration None of these. We can correct spherical aberration by: combining convex lens with concave lens by using three convex lens by using plano convex lens none of these. We can correct chromatic aberration by: Using two convex lens Using combination of convex and concave Using plano convex lens. None of these. Some times the shape of object appears bulged out or in. What do you call this type of problem of our eye: Myopia Astigmatism Hypermetropia None of these. How can we correct Myopia? By convex lens By using concave lens Using cylindrical lenses None of these. How can we correct Hypermetropia? Using convex lens Using concave lens Using cylindrical lens None of these.
