Recent questions tagged easy

A substance has a critical angle of $45^{\circ}$ for yellow light. What is its refractive index ?

asked May 25, 2016 by meena.p

1 answer

An unsymmetrical double convex thin lens, forms the image of a point object on its axis will the position of the image change in the lens is reversed ?

asked May 25, 2016 by meena.p

1 answer

The near vision of an average person is 25 cm . To view an object with an angular magnification of 10, What should be the power of the microscope ?

asked May 25, 2016 by meena.p

1 answer

Will the focus length of a lens for red light be more , same or less than that for blue light ?

asked May 24, 2016 by meena.p

1 answer

An astronomical refractive telescope has an objective of focal length 20 m and eye piece of focal length 2 cm

asked May 24, 2016 by meena.p

1 answer

A car is moving with a constant speed of 60 km/hr on a straight road. Looking at the rear view mirror the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km/hr. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car, after every 2s till the other car overtakes. If the two cars maintaining the speed , which of the following statement is /are correct ?

asked May 24, 2016 by meena.p

1 answer

The optical density of turpentine is higher than that water , while its mass density is lower a layer a tuperline floating over water in a container . For which one of the four rays incident on turpentine the path shown is correct ?

asked May 24, 2016 by meena.p

1 answer

The direction of ray of light incident on a concave mirror by PQ while direction in which the ray would travel after reflection four ray marked 1,2,3 and 4 . Which of the four rays correctly shown the direction of reflected ray ?

asked May 24, 2016 by meena.p

1 answer

The phenomenon involved in the reflection of radio- waves by ionosphere is similar to

asked May 24, 2016 by meena.p

1 answer

A passenger in an aeroplane shall

asked May 24, 2016 by meena.p

1 answer

An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus . The image

asked May 24, 2016 by meena.p

1 answer

A short pulse of white light is incident from air to a glass at normal incident . After travelling through the slab, the first colour to emerge is

asked May 24, 2016 by meena.p

1 answer

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

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

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

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. What is the angular magnification produced by the lens ?

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

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 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, 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

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

A person with a normal near point $(25 cm)$ using a compound microscope with an objective of focal length 8.0 mm and an eye piece of focal length 2.5 cm can bring an object placed 9.0 mm from the objective in sharp focus. what is the separation between the two lenses ? calculate the magnifying power of the microscope ?

asked Mar 3, 2016 by meena.p

1 answer

A compound microscope consists of an objective less of focal length $2.0\;cm$ and an eye -piece of focal legth $6.25\;cm$ , separated by a distance of 15 cm . How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm) .

asked Mar 3, 2016 by meena.p

1 answer

A compound microscope consists of an objective less of focal length $2.0\;cm$ and an eye -piece of focal legth $6.25\;cm$ , separated by a distance of 15 cm . How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (25 cm) . What is the magnifying power

asked Mar 3, 2016 by meena.p

1 answer

What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm. Is the system a converging or a diverging less ? Ignore the thickness of the thickness of the lenses

asked Mar 3, 2016 by meena.p

1 answer

An object of size $3.0\;cm$ is placed 14 cm in front of a concave lens of focal length $21\;cm$. Describe the image produced by the less. What happens if the object is moved further from the less ?

asked Mar 3, 2016 by meena.p

1 answer

An object of size $3.0\;cm$ is placed 14 cm in front of a concave lens of focal length $21\;cm$. Describe the image produced by the less.

asked Mar 3, 2016 by meena.p

1 answer

The predecessor of 1,234,456 is

asked Feb 25, 2016 by pady_1

1 answer

The sum of the place value and face value of 0 in 90,238,573 is

asked Feb 25, 2016 by pady_1

1 answer

The sum of the place value and face value of 4 in the number 65,462 is

asked Feb 25, 2016 by pady_1

1 answer

The difference between the place value and face value of 3 in the number 400,345

asked Feb 25, 2016 by pady_1

1 answer

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