1. Which of the following must be true in order for a refracting telescope to ma

ID: 1374457 • Letter: 1

Question

1. Which of the following must be true in order for a refracting telescope to magnify distant images?

a) the focal length of the eyepiece must be greater than the focal lenght of the objective

b) the focal lenght of the objective must be greater than the focal length of the eyepiece.

c) only the eyepiece must be a compound lens

d) both the eyepiece and the objective must be compound lenses.

2. Where will the objective form the image of a very distant object?

a) in front of objective

b) behind the objective but in the front of the focal point of the objective

c) at the focal point of the objective

d) behind the eyepiece.

The ratio between the focal lenght of the objective and the focal length of the eyepiece

is greater than 1 for telescope. That is,

f0 / fe > 1

Then, f0 > fe.

For telescope, the focal length of objective is greater than the focal length of the eyepiece.

Answer: Statement (b) is true.

The objective and eyepiece lenses are converging and both are the compound lenses for the telescope.

Answer: Statement (d) is true.

The image of a very distant object is formed at the front of the objective lens.

So, statement (a) is true.

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