Chapter 35: Q. 19 (page 1017)

A reflecting telescope is built with a $20 c m$ -diameter mirror having an $1.00$ m focal length. It is used with an $10 \times$ eyepiece.
What are:
(a) the magnification?
(b) the $f ‐ n u m b e r$ of the telescope?

Short Answer

Expert verified

(a). The magnification is $40$ .

(b). The $f ‐ n u m b e r$ of the telescope is $5.0$ .

Step by step solution

Part (a) Step 1: Given Information.

We need to find the magnification.

Part (a) Step 2: Simply.

$M_{e y e} = (25 c m) / f_{e y e}$

$f_{e y e} = 25 / 10 = 2.5 c m$

Therefore,

$M_{t e l e s c c o p e} = - f_{o b j} / f_{e y e} = 100 c m / 2.5 c m = 40 .$

Here $M_{e y e}$ magnification of the eye, $M_{t e l e s c c o p e}$ is the magnification of a telescope, $f_{e y e}$ focal length of the eye.

Part (b) Step 1: Given Information.

We need find the f - number of telescope.

Part (b) Step 2: Simply.

$f - n u m b e r = \frac{f}{D} = \frac{100 c m}{20 c m} = 5.0$

Here $f$ is focal length $D$ is the diameter.

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A reflecting telescope is built with a $20 c m$ -diameter mirror having an $1.00$ m focal length. It is used with an $10 \times$ eyepiece.
What are:
(a) the magnification?
(b) the $f ‐ n u m b e r$ of the telescope?

Short Answer

Step by step solution

Part (a) Step 1: Given Information.

Part (a) Step 2: Simply.

Part (b) Step 1: Given Information.

Part (b) Step 2: Simply.

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A reflecting telescope is built with a 20cm-diameter mirror having an1.00m focal length. It is used with an10×eyepiece.What are:(a) the magnification?(b) the f‐numberof the telescope?

Short Answer

Step by step solution

Part (a) Step 1: Given Information.

Part (a) Step 2: Simply.

Part (b) Step 1: Given Information.

Part (b) Step 2: Simply.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Conservation of Energy and Momentum

Wave Optics

Work Energy and Power

Torque and Rotational Motion

Electrostatics

Kinematics Physics

Study anywhere. Anytime. Across all devices.

A reflecting telescope is built with a $20 c m$ -diameter mirror having an $1.00$ m focal length. It is used with an $10 \times$ eyepiece.
What are:
(a) the magnification?
(b) the $f ‐ n u m b e r$ of the telescope?