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.

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

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

A convex lens A of focal length 20cm and a concave lens B of focal length 10 cm are kept along the same axis with a distance d between them. If a parallel beam, then d is

A convex lens A of focal length 20cm and a concave lens B of focal length 10 cm are kept along the same axis with a distance d between them. If a parallel beam, then d is

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

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 convex mirror of focal length 10 cm are placed co-axially 50 cm apart from each other. An incident beam parallel to its principal axis is incideent on the convex lens. Locate the position of final image formed due to the combination.

A convex lens of focal length 20 cm and a convex mirror of focal length 10 cm are placed co-axially 50 cm apart from each other. An incident beam parallel to its principal axis is incideent on the convex lens. Locate the position of final image formed due to the combination.

A convex lens of focal lenght 20 cm is placed coaxially with a concave mirror of focal length 10 cm at a distance of 50 cm apart from each other.A beam of ligh coming parallel to the principal axis is incident on the convex lens.Find the position diagram showing the formation of the imge.