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The final image in an astronomical telescope with respect to object is

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Important Questions on Ray Optics and Optical Instruments

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In compound microscope, the focal length and aperture of the objective used is respectively
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The magnifying power of a telescope with tube length 60cm is 5. What is the focal length of its eye piece?
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What is the magnifying power of a simple microscope of focal length 5 cm, if the image is formed at the distance of distinct vision?
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Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: For a simple microscope, the angular size of the object equals the angular size of the image.

Reason R: Magnification is achieved as the small object can be kept much closer to the eye than 25 cm and hence it subtends a large angle. In the light of the above statements, choose the most appropriate answer from the options given below:

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The focal lengths of objective lens and eye lens of a Galilean Telescope are respectively 30 cm and 3.0 cm. Telescope produces virtual, erect image of an object situated far away from it at least distance of distinct vision from the eye lens. In this condition the Magnifying Power of the Galilean Telescope should be :

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There are four lenses L1,L2,L3 and L4 of focal lengths, 2,4,6 and 8 cm respectively Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are
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If we need a magnification of 375 from a compound microscope of tube length 150mm and an objective of focal length 5mm, the focal length of the eye-piece, should be close to:
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An object is placed at a distance u from a microscope of focal length l. The angular magnification depends on
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An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer, the tree appears as
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To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :
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Your friend is having eye sight problem. She is not able to see clearly a distant uniform window mesh and it appears to her as nonuniform and distorted. The doctor diagnosed the problem as :
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In an astronomical telescope in normal adjustment a straight black line of the length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is l . The magnification of the telescope is:
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A convex lens of focal length 12.5 cm is used as a simple microscope. When the image is formed at infinite, Magnification is _________  (Near point for the normal vision is 25 cm).
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Remote sensing satellites move in an orbit that is at an average height of about 500 km from the surface of the earth. The camera onboard one such satellite has a screen of area A on which the images captured by it are formed. If the focal length of the camera lens is 50 cm, then the terrestrial area that can be observed from the satellite is close to:
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For the astronomical telescope, the focal length of objective lens is f0 and the eye piece lens is fe. Then the tube length of the telescope is _______.
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A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
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An object is seen through a simple microscope of focal length 10 cm. Find the angular magnification produced, if the image is formed at the near point of the eye which is 20 cm away from it.
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It the focal length of objective lens is increased then magnifying power of:
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A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If a 50 m tall tower at a distance of 1 km is observed through this telescope in a normal setting, the angle formed by the image of the tower is θ, then θ is close to
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A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance: