A light beam, passes from medium 1 to medium 2. Show that the emerging beam is parallel to the incident beam.

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 10 cm apart with their principal axes coinciding. A beam of light travelling parallel to the principal axis and having a beam diameter 5.0 mm, is incident on the combination. Show that the emergent beam is parallel to the incident one. Find the beam diameter of the emergent beam.

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 10 cm apart with their principal axes coinciding. A beam of light travelling parallel to the principal axis and having a beam diameter 5.0 mm, is incident on the combination. Show that the emergent beam is parallel to the incident one. Find the beam diameter of the emergent beam.

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 10 cm apart with their principal axes coinciding. A beam of light travelling parallel to the principal axis and having a beam diameter 5.0 mm, is incident on the combination. Show that the emergent beam is parallel to the incident one. Find the beam diameter of the emergent beam.

A converging lens of focal length 10cm and a diverging lens of focal length 5cm are placed 5cm apart with their principle axes coinciding. A beam of light travelling parallel to the incident one. Find the beam diameter of the emergent beam is parallel to the incident one. Find the beam diamter of the emergent beam. Alos find out the ratio fo emergent and incident intensities.

The cross section of a prism is a regular hexagon. A narrow beam of light strikes a face of the prism just below the midpoint (M) of the edge AB. The beam is parallel to the top and bottom faces of the prism. Final the minimum value of refractive index of the material of the prism for which the emergent beam will be parallel to the incident beam.

A beam of light passes from medium 1 to medium 2 to medium 3 as shown figure. What may be concluded about the three indices of refraction, n_(1),n_(2),and n_(3) ?

A beam of light passes from medium 1 to medium 2 to medium 3 as shown figure. What may be concluded about the three indices of refraction, n_(1),n_(2),and n_(3) ?

Light goes from medium M_1 to the medium M_2 . In which of the following cases, we are likely to get the weakest refracted beam ?