Fill ups
A ray of light passing through the focus of a concave mirror after reflection from the mirror becomes ……………. .

Define the principal focus of concave mirror.

The refractive index of the amterial of a prism is sqrt2 and its refracting angle is 30^@ .One of the refracting surface of the prism is made a mirror inwards.A beam of monochromatic light entering the prism from the other face will retrace its path after reflecting from the mirrored surface,if its angle of incidence on the prison is

Explain how a ray of light passing through a prism is deviated towards the base of the prism.

A mirror and a source of light are situated at the origin O and at a point on OX, respectively. A ray of light from the sources strikes the mirror and is reflected. If the direction ratios of the normal to the plane are 1, -1, 1, then find the DCs of the reflected ray.

Parallel rays incident on a mirror,after reflection converge at a point, then the mrirror will be …… .

Why a ray of light through centre of curvature if incident on a plane mirror, reflects back with the same path?

A ray of light passing through the point (1, 2) reflects on the x-axis at point A and the reflected ray passes through the point (5, 3). Find the coordinates of A.

A ray of light is incident at an angle 60^@ on a horizontal plane mirror.Through what angle ,should the mirror be tilted to make the reflected ray horizontal?