मराठी

An Object is Placed at a Distance of 12 Cm from a Convex Lens of Focal Length 8 Cm. Find : the Position of the Image and Nature of the Image - Physics

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प्रश्न

An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm. Find :

1) the position of the image

2) nature of the image

उत्तर

1)

Given data:

u = -12 cm, f = +8 cm, v = ?

Lens formula

`1/v - 1/u = 1/f`

`1/v - 1/(-12) = 1/8`

`1/v = 1/8 - 1/12`

v = 24 cm [Position of Image]

2) Nature if image : Real, inverted and magnified.

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2017-2018 (March) Set A

संबंधित प्रश्‍न

A student focuses the image of a well-illuminated distant object on a screen using a convex lens. After that, he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens.

(i) In which direction, towards the screen or away from the screen, does he move the lens?

(ii) What happens to the size of the image? Does it decrease or increase?

(iii) What happens to the image on the screen when he moves the object very close to the lens?


 Explain with the help of a diagram, why the convex lens is also called a converging lens.


A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.

 

A lens forms an upright and magnified image of an object. Name the lens.


A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.

(A) The device X is a convex lens of focal length 20 cm.

(B) The device X is a concave mirror of focal length 40 cm.

(C) The device X is a convex mirror of radius of curvature 40 cm.

(D) The device X is a convex lens of focal length 40 cm.


State two main differences between a convex and concave lens.

Draw neat diagram to show the
Convergent action of a convex lens,


Write the three characteristics of the image formed by a convex lens of focal length 20 cm for the object at distance (i) 10 cm, (ii) 30 cm, (iii) 40 cm, (iv) 60 cm from the lens.


Define the principal focus of a convex lens.


Can one bum a piece of paper in daylight by just using a convex lens instead of a match or any direct flame? Support your answer with the help of an appropriate ray diagram.


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