a) Define a wave front.
b) Draw the diagram to show the shape of plane wave front as they pass through (i) a thin prism and (ii) a thin convex lens. State the nature of refracted wave front.
c) Verify Snell’s law of refraction using Huygens’s principle

Deduce Snell's Law of refraction for a plane wave using Huygen's principle.

Draw a diagram to show refraction of a plane wave front incident in a convex lens and hence draw the refracted wave front

Using Huygens' principle for the wave theory of light, verify the law of refraction.

Figures shows a wave front P passing through two systems A and B, and emerging as Q and then as R. The systems A and B could, respectively, be

a) An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is (i) converging, and ii) diverging. b) State one practical use each of convex mirror, concave mirror, convex lens and concave lens.