A transparent cylinder has its right half polished so as to act as a mirror. A paraxial light ray is incident from left, that is parallel to principal axis, exits parallel to the incident ray as shown. The refractive index of the material of the cylinder is:

Q. A transparent cylinder of radius 2 m has a mirrored surface on its right half as shown in the figure. A light ray travelling in air is incident on the left side of the cylinder. The incident ray and exiting ray are parallel to each other and at a distance of 2 m. Choose the INCORRECT options :

Q. A transparent sphere of radius $R=2.0m$ has a mirror on the surface on its right half as shown in figure. A light ray travelling in air is incident on the left side of the sphere. The incident light ray (1) & exiting light ray (2) are parallel & separated by distance $d=2.0m$. Then find the refractive index of the material. (take: $\sin {15}^o=0.25$)

Q. A ray of light is incident on a lens parallel to its principal axis. After refraction, the ray passes through or appear to come from :

Q. A ray of light is incident on a concave mirror. If it is parallel to the principal axis, the reflected ray will