An astronomical telescope consists of two lenses: the objective lens and the eyepiece lens. The objective lens forms a real, inverted, and diminished image of a distant object. This image then serves as the object for the eyepiece lens, which forms a magnified, virtual, and inverted image for the observer. Hence, the final image is virtual, inverted, and magnified.
The final image formed by an astronomical telescope is \({\text{virtual, inverted, and magnified}} \), so the correct answer is (D).
A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field \( B \) exists into the page. The bar starts to move from the vertex at time \( t = 0 \) with a constant velocity. If the induced EMF is \( E \propto t^n \), then the value of \( n \) is _____.