A planet is observed by astronomical refracting telescope having an objective of focal length 16cm and an eyepiece of focal length 2cm.

A planet is observed by an astronomical refracting telescope having an objective of ofcal length 16m and an eyepiece of focal length 2 cm. Then,

A planet is observed by an astronomical refracting telescope having an objective of ofcal length 16m and an eyepiece of focal length 2 cm. Then,

A planet is observed by an astronomical reflecting telescope having an objective of focal length 16 m and eyepiece of focal length 2 cm

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

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

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

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

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