a. A light beam passes through a wedge with a small angle α at the vertex,
which is perpendicular to the front face of the wedge. Prove that the angle
of deflection of the ray from the initial direction is approximately (n − 1) α.
Refractive index of the wedge n.
b. A light ray passes through a wedge with a small angle α at the vertex,
which falls at a small angle γ to the normal to the front surface of the wedge.
Prove that the angle of deflection of the light beam from the initial direction
is approximately (n−1) α. Refractive index of the wedge n.
c. Print the formula for the focal length of a thin lens. The radii of curvature
of the lens surfaces are R1 and R2, and the refractive index of the lens material
is n.