image is not formed in mirror a (distance measured from mirror A)

A ray of monochromatic light is incident on one refracting face of a prism of angle 75∘. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is root 2, the angle of incidence on the first face of [...]

A ray incident at a point at an angle of incidence of 60∘ enters a glass sphere of refractive index 3–√ and is reflected and refracted at the farther surface of the sphere. The angle between the reflected and refracted rays at this surface is at which point image is not formed in mirror a [...]

A luminous point object is moving along the principal axis of a concave mirror of focal length 12 cm towards it. When its distance from the mirror is 20 cm its velocity is 4 cm/s. The velocity of the image in cm/s at that instant is at which point image is not formed in mirror [...]

A point object is kept between a plane mirror and a concave mirror facing each other. The distance between the mirrors is 22.5 cm. The radius of curvature of the concave mirror is 20 cm. What should be the distance of the object from the concave mirror so that after two successive reflections the final [...]

Two plane mirrors A and B are parallel to each other and spaced 20 cm apart. An object is kept in between them at 15 cm from A. Out of the following, at which point, image is not formed in mirror a (distance measured from mirror A) at which point image is not formed in [...]