State Brewter's law.Show that the reflected ray and the refracted ray are perpendicular to each other,when the angle of incidene is equal to polarising angle.

A ray of light falls on a transparent glass slab of refracative index 1.62. If the reflected ray and refracted rays are mutually perpendicular. What is the angle of incidence? Give calculations.

A ray of lght strikes a glass plate at an angle of incidence 57^@ .If the reflected and refracted rays are perpendicular to each other,find the refractive index of glass.

Light from a denser medium I goes to a rarer medium II.When angle of incidence is theta ,the reflected and refraced ray s are perpenciculat to each other .The crtitical angle is:

Show that at polarising angle, the reflected and refracted beams of light are at 90^@ to each other.

Euclid stated that all right angles are equal to each other in the form of :

Show that if the diagonals of a quadrilateral are qual and bisect each other at right angles, then it is a square

A ray of light from a rarer medium strikes a denser medium. The reflected and refracted rays make an angle of 90^@ with each other .the angles of reflection and refraction are r and r' .The critical angle would be