Question

Which of the following are functions of the eyepiece lens of a refracting telescope?
Check all that apply.

A to produce an image whose angular size is greater than that of the object
B to magnify the image produced by the objective lens
C to reverse the orientation of the image produced by the objective lens
D to form an image at the focal point of the objective lens

What must result if the eyepiece lens of a refracting telescope is replaced with a lens that has a shorter focal length?
Check all that apply.

A The length of the telescope must be reduced.
B The angular magnification produced by the telescope increases.
C The focal length of the objective lens decreases.
D The angular size of the image seen by the viewer increases.

Answer 1

The refracting consisting of two lens in which the first lens acts as the object for the second lens. The image formed by the objective lens is real and inverted and very near to the eyepiece focal point. The image formed by the objective lens acts as the object for the second lens and the final image will be enlarged than the first image. Therefore, the correct options are A and B. 2. The length of the telescope is eye piece J objecti ve If the length of the eyepiece is decreases, then the length of the telescope must be reduced The angular magnification of the image is, 0ojecthe fa The angular magnification is inversely proportional to the focal length of the eyepiece and therefore, the angular size increases. evepiece Therefore, the correct options are A, B, and D