An astronomical telescope has objective and eyepiece of focal lengths $40\text{cm}$ and $4\text{cm}$ respectively. To view an object $200\text{cm}$ away from the objective, the lenses must be separated by a distance of-

Q. A astronomical telescope has objective and eyepiece of focal lengths $40cm$ and $4cm$ respectively. To view an object $200cm$ away from the objective, the lenses must be separated by a distance:

Q. An astronomical telescope has objective eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective lens, the lenses must be separated by a distance,

Q. An astronomical telescope has the objective lens and the eyepiece of focal lengths $80\text{cm}$ and $5\text{cm}$ respectively. Find its magnifying power, if the final image is formed at a distance of $50\text{cm}$ from the eyepiece.

Q. A) A small telescope has an objective lens of focal length $140\text{cm}$ and an eyepiece of focal length $5.0\text{cm}$. What is the separation between the objective lens and the eyepiece?

B) A small telescope has an objective lens of focal length $140\text{cm}$ andan eyepiece of focal length $5.0\text{cm}$. If this telescope is used to view a $100m$ tall tower $3\text{km}$ away, what is the height of the image of the tower formed by the objective lens?

C) A small telescope has an objective lens of focal length $140\text{cm}$ and an eyepiece of focal length $5.0\text{cm}$. What is the height of the final image of the tower if it is formed at $25\text{cm}$? (Height of the image of the tower formed by the objective lens is $\frac{140}{30}\text{cm})$

Q. A terrestrial telescope has an objective lens and eyepiece of focal length $200\text{cm}$ and $4\text{cm}$ respectively. Separation between the objective lens and the eyepiece is $220\text{cm}$. The power of the erecting lens is $n^2\text{D}$. The value of $n$(integer only)