Light from the sun is falling directly upon a Ramsden eye-piece consisting of lenses of focal length `0.05`m. Find the position of the image formed and trace the path of rays through the eye-piece.

Rays of light are falling on a convex lens of focal length 40 cm . As shown in Fig. Determine the position of the image. .

Converging light rays are falling on a convex lens. If the focal length of the lens is 30 cm, then find the position of the image.

An astronomical telescope consisting of an objective of focal length 60cm and eye-piece of focal length 3 cm is focused on the moon so that the final image is formed at least distance vision, i.e. 25 cm from the eye-piece piece. Assuming the angular diameter of moon as 1//2^(@) at the objective, calculate (a) angular size and (b) lenear size of image seen through the telescope.

A compound microscope has an objective of focal length 2 cm and eye-piece of focal length 5 cm. The distance between the two lenses is 25 cm. If the final image is at a distance of 25 cm from the eye-piece, find the magnifying power of the microscope. What would be the magnifying power if the microscope were reversed ?

A small telescope has an objective lens of focal length 144 cm and an eye-piece of focal length 6.0 cm . What is the magnifying power of the telescope ? What is the separation between the objective and the eye-piece ?

A refracting telescope has an objective of focal length 1 m and an eye piece of focal length 20 cm . The final image of the sun 10 cm in diameter is formed at a distance of 24 cm from eye piece. What angle does the sun subtend at the objective ?

Rays of light from Sun falls on a biconvex lens of focal length f and the circular image of Sun of radius r is formed on the focal plane of the lens. Then