Four lenses of focal length 15 cm, 20 cm, 150 cm and 250 cm are available for making an astronomical telescope. To produce the largest magnification, what should the focal length of the eyepiece be?

Q. Four lenses of focal length $+15cm,+20cm,+150cm$ and $+250cm$ are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eyepiece should be

Q. Four lenses having the focal length of + 15 cm, 20cm, + 150cm, and +250cm respectively are provided to make an astronomical telescope. The focal length of the eyepiece to produce the. largest magnification, should be.

Q. Four lenses of focal length $\pm 15$ cm and $\pm 150$cm are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be

Q. Four lenses having the local length of +15 cm, 20 cm, +150 cm, and +250 cm respectively are provided to make a astronomical telescope. The focal length of the eyepiece to produce the largest magnification, should be :

Q. Focal length of objective lens and eyepiece of an astronomical telescope are $100\text{cm}$ and $2\text{cm}$ respectively. Find the angular magnification produced in the case of normal adjustment: