Using a convex lens a student obtained a sharp image of the grill of a window in the

a student obtained a sharp image of the grill of a window on a screen using a convex lens teacher suggested him focussing of a distant tree instead of the grill in which direction should the lens moved for this purpose explain with diagram

2- explain the best way to do the experiment for finding the focal length of a concave mirror by obtaining the image of distant object explain in nice way

how to determine the the focal length of a concave mirror by one needle method.i need procedure n observations urgently...

A sharp image of a distant object is obtained on a screen using a convex lens. In order to determine the focal length of a lens, a student needs to measure the distance between:

a)lens and the object

b)lens and the sreen

c)object and the screen

d)lens and the screen and also object and the screen.

In an experiment to determine the focal length of a convex lens, a student obtained a

A student determines the focal length of a device X  by focusing the image of a distant object on the screen placed on the same side of the object.The device X is:-

a)Cocave lens

b)Convex lens

c)Concave mirror

d)Convex mirror

for finding the focal length of a concave mirror by obtaining the image of a distant object, which one of the following would you like to focus?

(a) flame of a candle kept at the other end ofthe table

(b)any distant tree.

(c)window grill of the laboratory.

(d)a well lit distant tower.

plez give explanation for this question.......

A student obtained a sharp inverted image of a distant tree on a screen placed in front of the concave mirror. He then removed the screen and tried to look into the mirror.
He would now see
(A) A very blurred image on the wall opposite to the mirror
(b) an erect and magnified image of the tree in the mirror
(c) no image as the screen has been removed
(d) a highly diminished inverted imagae of the tree at the focus of the mirror 

Experts please give appropriate explanation

In an expriment to determine the f of a convex lens, a student obtained a sharp inverted image of a distant tree on the screen behind the lens. She then removed the screen and looked through the lens in the direction of the object. She will see:-

a] an inverted image of the tree at the focus

b] no image as the screen is removed

c] a blurred image on the wall of the lab

d] an erect image of the tree on the lens

PLEASE EXPLAIN TOO

a student obtained a sharp image of grils of a window on a white screen using a concave mirror. his teacher remarked that for getting better value of focal length of the mirror he could focus a well let distant object(preferably the sun) on the screen. what should the student do for this purpose?

1. move the mirror and the screen towards the object.

2. move the mirror and the screen away from the object.

3. move the screen slightly away from the mirror.

4. move the mirror slightly towards the screen.

MCQ-

In the experiment to determine focal length of concave lens,a student obtained a sharp image of a distant tree on the screen behind the lens.The student then removed the screen and looked through the lens in the direction of the object. He will see

a an inverted image of treee at the focus of lens.

b no image

c a blurred image on the lens surface

d an erect image of tree at focus of lens

plzz explain the reason for ur ans

please give me the observation table on Science practical "determination of focal lenght of concave mirror and convex lens "' .its very urgent

By using a concave mirror a student obtained a sharp image of his laboratory window on a screen.His teacher suggested to focus some disatant object such as a distant tree to get better results .In which direction should he move the lens for this purpose ?

A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, he will have to shift the mirror

a) towards the screen b)away from screen c)either towards or away from screen, depending upon the position of the object

d)to a position very far away from the screen

Please also give the explanation.

In an experiment to determine the focal length of a convex lens,a student obtained a sharp inverted image of a distant image on the screen behind the lens.she then rempved the sreen and looked trought the lens.she will see what?

A student obtained a blurred image of an object while using a concave mirror (or even convex lens) on a screen.

1. Should he/she move the screen towards or away from the mirror to obtain a clear and sharp mirror?

2. What if it was give that the object was a distant object? What would be the answer?

MCQ-

Positive linear magnification greater than one for convex lens indicates

a real image

b virtual image

c image having smaller size than the object

Q31

A student has obtained an image of a distant object on a screen to determine the focal lengthF₁of the given lens. His teacher, after checking the image, gave him another lens of focal lengthF₂and asked him to focus the same object on the same screen. The student found that to obtain a sharp image, he has to move the lens away from the screen. From this finding, we may conclude that both the lenses given to the student were :(A) Concave and F₁₂(B) Convex andF₁F₂(C) Convex and F₁ F₂

(D) Concave and F₁ F₂

your school laboratory has one large window.to find the focal length of a concave mirror using one of the walls as the screen,the experiment may be performed

a)nera the wall opposite to the window

b)on the same wall as the window

c)on tyhe wall adjacent to the window

d)only on the table as per the laboratory arrangement

An object moves a distance 'f' between 2f and f of a concave mirror. The image would have travelled a distance of :

(a) f , (b) 2f, (c) f/2, (d) infinity ??

A student is to find the focal length of (i) a concave mirror (ii) a convex lens by focusing the

A student has to determine the focal length of a concave mirror by obtaining the image of a distant object on a screen.For getting best result he should focus

(A) a distant tree or an electric pole

(B)a well-illuminated distant building

Give reason for your answer.

A student has to determine the focallength of a concave mirror by obtaining the image of a distant object on the screen . Forgetting best result he should focus

A a distant tree or an electric pole

B a well illuminated distant building

C well-lit grills of the nearest window

D a burning candle placed at the distant edge ofthe lab table.

Plz answersoon , experts have giventhumps up for Option A and D and I saw in a book as B...... me so confused plz reply soon

 The image of a bright object is brought on a screen with a concave mirror ,if the upper half of the mirror is covered what is the effect on the image ?

A. its size is halved

B. brightness is reduced

C. image changes position 

D. image dissapears                                    i am also in need of explanation

 an object 5 cm high is held 25 cm away from converging lens 10 cm focal length is 10cm ? draw suitable scale diagram. find the position and size of image is real or virtual?

MCQ-

Which lens has virtual focus

a convex

b concave

c none

vertical shift in refraction of light

Magnifying glass is concave or convex lens?

difference between mirror and lens formula?.

an object 2cm of height is kept at a distance of 1.5f from pole of concave mirror , the size of the image will be??

pls expalin in detail..

A student obtained a sharp inverted image of a distant tree on a screen placed in front of the concave mirror.He then removed the screen and tried to look into the mirror. He would now see-

(A) a very blurred image on the wall opposite to the mirror

(B) an erect and magnified image of the tree in the mirror

(C) no image as the screen has been removed

(D) a highly diminished inverted image of the tree at the focus of the mirror

Please give Correct ANSWER and REASON

IN AN EXPERIMENT THE FOCAL LENGHT OF A CONVEX LENS A STUDENT OBTAINED A SHARP INVERTED IMAGE OF A DISTSNT TREE ON THE SCREEN BEHIND THE LENS.SHE THEN REMOVED THE SCREEN AND LOOKED THROUGH THE LENS IN THE DIRECTION OF THE OBJECT SHE WILL SEE:

1.AN INVERTED IMAGE OF THE TREE AT THE FOCUS OF THE LENS

2.NO IMAGE AS THE SCREEN HAS BEEN REMOVED

3.A BLURRED IMAGE ON THE WALL OF THE LABOURATORY

4.AN ERECT IMAGE OF THE TREE ON THE LENS

 shouldn't focal leanght be negative according to sign convention ?????

Pls reply fast !!!!!! I have a practical exam on SUNDAY !!!!!!!!!!!!!!!!!