A simple telescope, consisting of an objective of focal length `60cm` and a single eye lens of focal length `5cm` is focused on a distant object in such a way that parallel rays emerge form the eye lens. If the object makes an angle of `2^(@)` at the objective, the angular width if the image isA. `10^(@)`B. `24^(@)`C. `50^(@)`D. `48^(@)`

A simple telescope, consisting of an objective of focal length `60cm`

1.	A simple telescope, consisting of an objective of focal length `60cm` and a single eye lens of focal length `5cm` is focused on a distant object in such a way that parallel rays emerge form the eye lens. If the object makes an angle of `2^(@)` at the objective, the angular width if the image isA. `10^(@)`B. `24^(@)`C. `50^(@)`D. `48^(@)`
Answer» Correct Answer - B `m =- (f_(0))/(f_(e)) =- (60)/(5)=- 12` `m = (theta)/(theta_(0)) rArr 12 = (theta)/(2^(@)) rArr theta = 24^(@)`

Discussion

No Comment Found

Related InterviewSolutions

The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will beA. `0.1 sec`B. `0.2 sec`C. `1.0 sec`D. `0.6 sec`
A lady cannot see objects closer than `40cm` from the left eye and closer than `100cm` from the right eye. While on a mountaining trip, she is lose from her team. She tries to make an astronomical trip, from her reading glasses to look from her teammates. (a) Which glass should she use as the eyepiece? (b) What magnification can she get with relaxed eye?
A compound microphone has an objective of focal length 1 cm and an eyepiece of focal length 2.5 cm. An object has to be placed at a distance of 1.2 cm awy from the objective for normal adjustment. a.Find the angular magnification. b.Find the length of the microscope tube.
A small object is placed at distance of 3.6 cm from a magnifier of focal length 4.0 cm. a. find the position of theimage. B. find the linear magnification c. Find the angular magnification.
In previous question, the magnifying power of the microscope isA. `10`B. `15`C. `20`D. `30`
A nearsighted man can clearly see objects up to a distance of 1.5m. Calculate the power of the lens of the spectacles necessary for the remedy of this defect.
The magnifying power of a compound microscope isA. objective magnification`//`eyepiece magnificationB. objective magnification`xx`eyepiece magnificationC. eyepiece magnification`//`objective magnificationD. objective magnification`+`eyepiece magnification
(a) An object is seen through a simple microscope of focal length `12cm`. Find the angular magnification produced if the image is formed at the near point of the eye which is `25cm` away from it. (b) A `10D` lens is used as a magnifier. Where shold the object be placed to obtain maximum angular magnification for a nirmal eye (near point `= 25cm)`?
An object is seen thorugh a simple microscope of focal length 12 c. Find the angular mgnification produced if the image is formed at the near pointofhe eye which is 25 cm away from it.
(a) An object is seen through a simple microscope of focal length `12cm`. Find the angular magnification produced if the image is formed at the near point of the eye which is `25cm` away from it. (b) A `10D` lens is used as a magnifier. Where should the object be placed to obtain maximum angular magnification for a normal eye (near point `= 25cm)`?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment