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## A small Keplerian telescope has an objective with a 1.33 m focal length. Its eyepiece is a 2.82 cm focal length lens. It is used to look at

Question

A small Keplerian telescope has an objective with a 1.33 m focal length. Its eyepiece is a 2.82 cm focal length lens. It is used to look at a 25000 km diameter sunspot on the sun, a distance 1.5*108 km from Earth.

Required:

What angle is subtended by the sunspot’s telescopic image in degree?

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Physics
3 years
2021-08-16T03:44:48+00:00
2021-08-16T03:44:48+00:00 1 Answers
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## Answers ( )

Answer:The angle is

Explanation:From the question we are told that

The objective focal length

The eyepiece focal length is

The diameter of the sunlight is

The distance of the sun from from the earth is

Generally the magnification of the object is mathematically evaluated as

The negative sign is because the lens of the telescope is diverging light

substituting values

Now we can obtain the angle made by the object (sunlight ) with respect to the telescope as follows

substituting values

The magnification can also be mathematically represented as

Where is the angle the image made with telescope

Since the negative sign indicate direction of light movement we will remove it from the calculation below

=>

=>