The objective of an astronomicaltelescope consists of two thin lenses in contact, of focal lengths + 20 cm and -25 cm respectively. Eyepiece of the same telescope consists of two plano convex lenses each of focal length f separated by 2/3 f as shown in the figure. Find the value of l for which final image will be formed at infinity with its angular magnification 100/3. Also find f.
Physics · Geometrical optics · optical instruments
The objective of an astronomicaltelescope consists of two thin lenses in contact, of focal lengths + 20 cm and -25 cm respectively. Eyepiece of the same telescope consists of two plano convex lenses each of focal length f separated by 2/3 f as shown in the figure. Find the value of l for which final image will be formed at infinity with its angular magnification 100/3. Also find f.
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