Lens making

An equiconvex lens has its two surfaces of radius of curvature R = 10 cm . Thickness of the lens at its centre is 2 cm. A light ray is incident making an angle of 2° with the optic axis of the lens. Find the angle that the emergent ray will make with the optic axis. The refractive index of all media is as marked in the Figure.

Statement 1:Plexiglas is the commerical name of PMMA Statement 2:It is used in making contact lens.because it has an excellent lighr=transmission property.

a) What type of images can a convex lens make? b) What type of image is always made by a concave lens?

A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be

Derive lens maker's formula for a thin convex lens.

A 20cm convex lens is placed in contact with a diverting lens of unknown focal length ,The lens combination acts as a converging lens and has a length of 30cm .What is the focal length of the diverging lens.

Under what condition, a concave lens can make a real image.