A telescope using an eye piece of focal ...

A telescope using an eye piece of focal length 3 cm has a magnification 10 in normal adjustment. If the telescope is now used to view an object placed at a distance of 180 cm from the objective, the new length of the telescope is (assume final image is at infinity).

36 cm

39 cm

32 cm

33 cm

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

RAY OPTICS
TARGET PUBLICATION|Exercise EVALUATION TEST|16 Videos
RAY OPTICS
TARGET PUBLICATION|Exercise CRITICALTHINKING|38 Videos
OPTICS
TARGET PUBLICATION|Exercise EXERCISE|447 Videos
REFRACTION OF LIGHT
TARGET PUBLICATION|Exercise EVALUATION TEST|15 Videos

Similar Questions

Explore conceptually related problems

A telescope using an eye piece of focal length 2 cm has a magnification 20 in normal adjustment. If the telescope is now used to view an object placed at a distance of 2 m from the objective, the new length of the telescope is (assume final image is at infinity).

An object is placed at a distance of 15 cm from a convex lens.If the focal length of the lens is 60cm,find the image distance.

An object is placed at a distance of 10cm from a convex lens of focal length 12cm.Find the position and nature of the image.

An object is placed at a distance of 36 cm from a concave mirror of focal length 12 cm. Find the image distance.

A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

A lens with a focal length of 25 cm produces real image of an object at a distance of 50 cm from the lens. At what distance the object placed from the lens?

When a convex lens of 2.5 cm focal length is used as a magnifying glass, normal eye can see an object clearly at a distance of 25 cm. The magnifying power of the instrument is

An arrow is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find the image distance.

An object is kept at a distance of 60 cm in front of a convex lens. Its real and inverted image is fonned at a distance of 20 cm from the lens. Find the focal length of the lens.

Relative difference of focal lengths of objective and eye lens in the microscope and telescope is given as

TARGET PUBLICATION-RAY OPTICS-COMPETITIVE THINKING

To avoid spherical aberration, quality reflecting telescopes use mirro...
Text Solution
|
An astronomical telesope has objective and eyepiece of focal lengths 4...
Text Solution
|
A telescope using an eye piece of focal length 3 cm has a magnificatio...
Text Solution
|
In an astronomical telescope in normal adjustment a straight black lin...
Text Solution
|
The ratio of the diameter of the sun to the distance between the earth...
Text Solution
|
A point object is held above a thin equiconvex lens at its focus. The ...
Text Solution
|
A concave lens of glass, refractive index 1.5 has both surfaces of sam...
Text Solution
|
Given a point source of light, which of the following can produce a pa...
Text Solution
|
choose the correct option
Text Solution
|
An infinitely long bar lies alont the adis of cancave mirror of focal...
Text Solution
|
Diameter of a plano-convex lens is 6cm and thickness at the centre is ...
Text Solution
|
The image of an object, forme by a plano-convex lens at a distance of ...
Text Solution
|
By placing a comvex lens of focal length equal to 15.0 cm between an o...
Text Solution
|
For a normal eye, the cornea of eye provides a converging power of 40 ...
Text Solution
|
A person can see objects clearly only when they lie between 50cm and ...
Text Solution
|
The focal length of a plano-convex lens is f and its refractive index ...
Text Solution
|
A convex lens of glass (mu(g)=1.45) has focal length f(g) is air. The ...
Text Solution
|
Convex lens is made of glass of refractive index 1.5 If the radius of ...
Text Solution
|
Relative difference of focal lengths of objective and eye lens in the ...
Text Solution
|
Three thin lenses are combined by placing them in contact with each ot...
Text Solution
|