Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?
A)The top half of the image will be blacked out.
B)The lower half of the image will be blacked out.
C)The entire image will be blacked out, since the entire lens is needed to form an image.
D)The image will appear as it would if the objective were not blocked, but it will be dimmer.
E)There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.

Question

Quizplus · Accepted Answer

Blocking part of the objective lens reduces the amount of light entering the telescope, making the image dimmer, but it does not affect the entire image formation. The entire image is still formed, just with less brightness.

Consider the Image Formed by a Refracting Telescope