A small telescope has an objective lens ...

A small telescope has an objective lens of focal length `144 cm` and an eye-piece of focal length `6.0 cm`. What is the magnifying power of the telescope ? What is the separation between the objective and the eye-piece ?

`0.75 cm`

`1.38 cm`

`1.0 m`

`1.5 m`

Text Solution

Verified by Experts

The correct Answer is:

The separation between the objective and the eyepiece = Length of the telescope tube `f = f_(0) + f_(e)`
Here, `f_(0) = 144 cm, = 1.44 m, f_(e) = 6.0 cm = 0.06 m`
`:. F = 1.44 + 0.06 = 1.5 m`

Topper's Solved these Questions

RAY OPTICS AND OPTICAL INSTRUMENTS
NCERT FINGERTIPS|Exercise Miscellaneous|9 Videos
RAY OPTICS AND OPTICAL INSTRUMENTS
NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos
RAY OPTICS AND OPTICAL INSTRUMENTS
NCERT FINGERTIPS|Exercise Some Natural Phenomena Due To Sunlight|2 Videos
PRACTICE PAPPER
NCERT FINGERTIPS|Exercise Practice Paper 3|50 Videos
SEMICONDUCTOR ELECTRONICS : MATERIALS , DEVICES AND SIMPLE CIRCUITS
NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

A telescope has an objective of focal length 100 cm and an eye-piece of focal length 5 cm. What is the magnifying power of the telescope when it is in normal adjustment?

A small telescope has an objective lens of focal length 150 cm and an eye piece of focal length 6.0 cm. The magnifying power of the telescope for distinct vision adjustment is:

A small telescope has an objective lens of focal length 140 cm and eye piece of focal length 5.0 cm . What is the magnifying power of telescope for viewing distant objects when (a) the telescope is in normal adjustment (i.e. when the image is at infinity) (b) the final image is formed at the least distance of distinct vision (25 cm) .

A telescope has an objective of focal length 100 cm and an eyepiece of focal length 5 cm. What is the magnifying power of the telescope when the final image is formed at the least distance of distinct vision ?

A telescope has an objective of focal length 30 cm and an eyepiece of focal length 3 cm. It is used to focus on an object at a distance of 2 m. Calculate the separation between the objective and the eyepiece for seeing with relaxed eye.

A telescope has an objective of focal length 30 cm and an eye piece of focal length 3.0 cm . It is focussed on a scale distant 2.0 m . For seeing with relaxed aye, calculate the separation between the objective and eye piece.

NCERT FINGERTIPS-RAY OPTICS AND OPTICAL INSTRUMENTS-Optical Instruments

When objects at different distances are seen by the eye, which of the ...
Text Solution
|
An under-water swimmer cannot see very clearly even in absolutely clea...
Text Solution
|
The nearer point of hypermetropic eye is 40 cm. The lens to used for i...
Text Solution
|
When a telescope is in normal adjusment, the distance of the objective...
Text Solution
|
A compound microscope consists of an objective lens with focal length ...
Text Solution
|
In a compound microscope, the focal lengths of two lenses are 1.5 cm a...
Text Solution
|
A person with a normal near point (25 cm) using a compound microscope ...
Text Solution
|
The final image in an astronomical telescope adjustment, a straingt bl...
Text Solution
|
In an astronomical telescope in normal adjustment a straight black lin...
Text Solution
|
The focal length of the lensese of an astronomical telescope are 50 cm...
Text Solution
|
A small telescope has an objective lens of focal length 144 cm and an ...
Text Solution
|
An astronomical refractive telescope has an objective of focal length ...
Text Solution
|
A gaint refrecting telescope at an observatory has an objective lens o...
Text Solution
|
A small telescope has an objective lens of focal length 140 cm and an ...
Text Solution
|
A reflecting type telescope has a large concave spherical mirror of ra...
Text Solution
|
A giant telescope in an observatory has an objective of focal length 1...
Text Solution
|