A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to $$\frac{3}{4}$$ of the angle of the prism. The angle of deviation is

A convex lens of focal length $$f$$ is placed somewhere in between an object and a screen. The distance between the object and the screen is $$x$$. If the numerical value of the magnification produced by the lens is $$m$$, then the focal length of the lens is

Focal length of a convex lens will be maximum for

Consider a glass slab which is silvered at one side and the other side is transparent. Given the refractive index of the glass slab to be 1.5. If a ray of light is incident at an angle of $$45^{\circ}$$ on the transparent side, then the deviation of the ray of light from its initial path, when it comes out of the slab is