Recent questions tagged ch-9

A ray of light incident at an angle $\theta$ on an refracting face of a prism emerge from the other face normally . If the angle of the prism is 5 and the prism is made of a material of refractive index 1.5 , the angle of incident is

asked May 24, 2016 by meena.p

1 answer

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards .A current in the coil produces a defection of $35^{\circ}$ of the mirror . What is the displacement of the reflected spot of light on ascreen 1.5 m away ?

asked May 24, 2016 by meena.p

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A carsegrainian telescope user two mirrors such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of large mirror is $220\;mm$ and the small mirror is 140 mm, where will the find image of the object at infinity be ?

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity ). What is the height of the final image of the tower if it is formed at 25 cm ?

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity ).If this telescope is used to view a 100 cm tall tower 3 km away , what is the height of the image of the tower formed by the objective lens ?

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity ) What is the seperation between the objective lens and eyepiece ?

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity )When the final image is formed at the least distance of distinct vision (25 cm)

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the seperation between the objective lens and the eye piece ?

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity ) When the final image is formed at the least distance of distinct vision $(25 cm)$

asked May 23, 2016 by meena.p

1 answer

A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity )

asked May 23, 2016 by meena.p

1 answer

An angular magnification (magnifying power ) of 30 x is desired using an objective of focal length 1.25 cm and an eye piece of focal length 5 cm. How will you set up the compound microscope ?

asked May 23, 2016 by meena.p

1 answer

When viewing through a compound microscope our eyes should be positioned not on the eye piece, but a short distance away from it for best viewing , why ? How much should be the short distance between the eye and the eyepiece ?

asked May 23, 2016 by meena.p

1 answer

Why must both the objective and eyepiece of a compound microscope have short focal length ?

asked May 23, 2016 by meena.p

1 answer

Magnifying power of simple microscope is inversely proportional to the focal length of the lens . What then stops us from using a convex lens of smaller focal length and achieve greater and greater magnifying power ?

asked May 23, 2016 by meena.p

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In viewing through a magnifying glass, one usually position one's eye very close to the lens , Does angular magnification change if the eye is moved back ?

asked May 23, 2016 by meena.p

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The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by the magnifying lens. In what sense does a magnifying glass provided angular magnification ?

asked May 23, 2016 by meena.p

1 answer

What should be the distance between the object and magnifying glass (converging lens of focal length 10 cm) if the virtual image of each square is to have an area of $6.25 mm^2$, would you be able to see the square distinct with your eyes very close to magnifier ?

asked May 23, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. At what distance should the lens be held from the card sheet in order to view the squares distinct with the minimum possible magnifying power ? Is the magnification equal to the magnifying power in this case ? explain

asked May 20, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. At what distance should the lens be held from the card sheet in order to view the squares distinct with the minimum possible magnifying power ? What is the magnification in this car ?

asked May 20, 2016 by meena.p

2 answers

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye. At what distance should the lens be held from the card sheet in order to view the squares distinct with the minimum possible magnifying power ?

asked May 20, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. Is the magnification same as the magnifying power ? explain

asked May 20, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. What is the angular magnification produced by the lens ?

asked May 20, 2016 by meena.p

1 answer

A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. What is the magnification produced by the lens ? How much is the area of each square in the virtual image ?

asked May 20, 2016 by meena.p

1 answer

A man with normal near point (25 cm) reads a book with small print using a magnifying glass a thin convex less of focal length 5 cm what are the closest and farthest distance at which he can read the book , When viewing through the magnifying glass? What is the maximum and the minimum angular magnification possible using the above simple microscope ?

asked May 20, 2016 by meena.p

1 answer

A man with normal near point (25 cm) reads a book with small print using a magnifying glass a thin convex less of focal length 5 cm what are the closest and farthest distance at which he can read the book , When viewing through the magnifying glass?

asked May 20, 2016 by meena.p

1 answer

A person looking at a person wearing a shirt with a pattern comprising vertical and horizontal lines is able to see the vertical lines more distinctly than the horizontal lines . what is the defect due to ? How is such a defect of vision corrected ?

asked May 18, 2016 by meena.p

1 answer

A muopic person has been using spectacles of power -1.0 D for distant vision . During old age , he also needs to use separate reading glasses of power +2.0 D. Explain what may have happened ?

asked May 18, 2016 by meena.p

1 answer

Does short sighted ness (myopia) or long sightedness imply necessarily that the eye has partially lost its ability of accommodation ? If not what might cause these defects of vision ?

asked May 18, 2016 by meena.p

1 answer

For a normal eye, the far point is at infinity and the near point of distinct vision is about 25 cm in front of the eye. The cornea of the eye provides a converging power of about 40 diepter and the least converging power of eye lens behind the cornea is about 20 dioptre. From this rough data, estimate the range of accommodation of normal eye .

asked May 18, 2016 by meena.p

1 answer

You are given prisms made of crown glass and flint glass with a wide variety of angles. suggest a combination of prism which will deviate a pencil of white light with out much dispersion . which will displace a pencil of white light with out much deviation .

asked May 18, 2016 by meena.p

1 answer

You are given prisms made of crown glass and flint glass with a wide variety of angles. suggest a combination of prism which will deviate a pencil of white light with out much dispersion .

asked May 17, 2016 by meena.p

1 answer

At what angle should a ray of light be incident on the face of a prism of refracting angle $60^{circ}$ , So that it just suffers total internal reflection at the other face ? The refractive index of the prism is $1.524$

asked May 17, 2016 by meena.p

1 answer

An object 1.5 cm in placed on the side of the convex lens, where two lenses of focal lengths 30 cm and 20 cm are placed 8.0 cm apart with their principle axis coincident . The distance between the object and the convex lens is 40 cm. Determine the magnification produced by two lens system and size of the image

asked May 17, 2016 by meena.p

1 answer

Determined the effective focal length of the combination of two lenses of focal length 30 cm and 20 cm if they are placed 8.0 cm apart with their principal axes coincident. Does the answer depend on which side a beam a parallel light is incident ? Is the motion of effective focal length of system useful at all ?

asked May 17, 2016 by meena.p

1 answer

A screen is placed 90 cm from an object . The image of the object is formed by a convex lens at two different location separated by 20 cm. Determined the focal length of the lens .

asked May 17, 2016 by meena.p

1 answer

The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a large convex lens . What is the maximum possible focal length of the lens required for the prupose?

asked May 17, 2016 by meena.p

1 answer

The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to diamond cutter ?

asked May 17, 2016 by meena.p

1 answer

Does the apparent depth of a tank of water change if viewed obliquely ? If so does the apparent depth increase or decrease ?

asked May 17, 2016 by meena.p

1 answer

A diver under water looks obliquely at a fisherman standing on the bank of a lake. would the fisherman look taller or shorter than what he actually is?

asked May 13, 2016 by meena.p

1 answer

You have learnt that plane and convex mirror produce virtual images of objects . can they produced real images under some circumstances . Explain

asked May 13, 2016 by meena.p

1 answer

A cross section of a light pipe made of a glass fibre of refractive index 1.68 . The outer covering of the pipe is made of material of refractive index 1.44 . What is the answer if there is no outer using of the pipe ?

asked May 13, 2016 by meena.p

1 answer

A cross section of a light pipe made of a glass fibre of refractive index 1.68 . The outer covering of the pipe is made of material of refractive index 1.44 . What is the range of the angles of incident rays with the axis of pipe for which the total reflection inside the pipe takes place .

asked May 13, 2016 by meena.p

1 answer

A small pin fixed on a table top is viewed from above from a distance of 50 cm. By What distance would the pin appear to be raised , if it be viewed from the same point through a 15 cm thick glass slab held parallel to the table ? $\mu$ of glass is 1.5 . Does the answer depended on location of the slab ?

asked May 13, 2016 by meena.p

1 answer

use the mirror equation to deduce that an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.

asked May 13, 2016 by meena.p

1 answer

use the mirror equation to deduce that, the virtual image produced by a convex mirror is always diminished i size and is located between the focus and the pole.

asked May 13, 2016 by meena.p

1 answer

use the mirror equation to deduce that a convex mirror always produces a virtual image independent of the location of the object.

asked May 13, 2016 by meena.p

1 answer

use the mirror equation to deduce that an object placed between f and 2f of a concave mirror produces a real image beyond 2f.

asked May 12, 2016 by meena.p

1 answer

A giant refracting telescope at an observatory has an objective lens of focal length 1.0 cm is used , what is the angular magnification of the telescope ? if this telescope is used to view the moon, what is the diameter of the image of the moon formed by this objective lens? The diameter of the moon is $3.48 \times 10^6 \;m$ and radius of the lunar orbit is $3.8 \times 10^8\;m$

asked May 12, 2016 by meena.p

1 answer

A giant refracting telescope at an observatory has an objective lens of focal length 1.0 cm is used , what is the angular magnification of the telescope ?

asked May 12, 2016 by meena.p

1 answer

A small telescope has an objective terms 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 seperation between the objective and the eyepiece ?

asked May 12, 2016 by meena.p

1 answer

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