Answer :

The ray diagram of a refracting telescope is shown below.



Source: Wikimedia commons


Note that feand foare the focal lengths of the objective and the eyepiece respectively. Also, note that the lens on the left is the objective and the one of the right is the eyepiece.


Option (a):


We can see from the diagram that the length of the tube is given by:




Hence, option (a) is correct.


Option (b):


The magnification of a refracting telescope is given by:




Hence, option (b) is correct.


Option (c):


A refracting telescopes forms an inverted image as it can be seen from the ray diagram. Light emanating from far away objects (e.g. stars) pass through the objective and converge at the second focus of the objective which is also the first focus of the eyepiece. The image formed is inverted and real. Now taking this real image as the object, we get a virtual image far away formed by the eyepiece. As virtual images have the same vertical orientation as the object, the image formed is inverted. Hence, option (c) is correct.


Option (d):


Changing the aperture of the lens has no effect on chromatic aberration. Hence, (d) is incorrect.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

Define the magnifPhysics - Board Papers

There are two souPhysics - Exemplar

Draw a labelled rPhysics - Board Papers

Define power of aPhysics - Exemplar

A magnifying glasPhysics - Exemplar

An astronomical rPhysics - Exemplar

A myopic adult haPhysics - Exemplar