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

An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm.

An astronomical telescope has an objective lens of focal length 20 m and eyepiece of focal length 1 cm. Find the angular magnification of the telescope.

A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. what is the separation between the objective lens and the eyepiece?

A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope?

A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. (A) If this telescope is used to view a 100 m tall tower 3 km away, what is the height of the image of the tower formed by the objective lens? (B) What is the height of the final image of the tower if it is formed at 25 cm?

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

A telescope has an objective of focal length 50 cm and eye-piece of focal length 5 cm.the last distance of distinct vision is 25 cm.The telescope is focussed for ditinct vision on a scale 200 cm awya from teh objective.Caculate the sepration between the objective and eye-piece