13. The circular boundary of the concave mirror subtends a cone of half angle o at its centre of curvature. The minimum value of O for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is TTTTT

The circular boundary of the concave mirror subtends a cone of half angle theta at its centre of curvature. The minimum value of theta for which any ray incident on this mirror parallel to the principal axis suffers reflection more than once is .

The circular boundary of the concave mirror subtends a cone of half angle theta at its centre of curvature. The minimum value of theta for which any ray incident on this mirror parallel to the principal axis suffers reflection more than once is .

A point source of light is placed at the centre of curvature of a concave mirror. The angle of deviation of the rays incident on the mirror from this source and reflected from it, is

Show with a neat diagram, the direction of the reflected ray in case of a concave mirror if the incident ray is : Parallel to the principal axis,

A ray of light is incident on a concave mirror along its principal axis.What will be the angle of reflection?

The aperture diameter of a spherical mirror is D = etaR where eta is a positive number less than 2 and R is radius of curvature of the mirror. Consider a wide parallel beam of light incident on the mirror parallel to its principal axis. (a) Find minimum value of h for which marginal rays start getting reflected twice. (b) Find minimum value of h for which marginal rays undergo three reflections.