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Standard XII
Physics
Cutting of Thin Lenses
Question

A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque. Then
  1. Only half of the image will be visible
  2. The image position shifts away from the lens
  3. The image position shifts towards the lens
  4. The brightness of the image reduces.

A
Only half of the image will be visible
B
The image position shifts away from the lens
C
The brightness of the image reduces.
D
The image position shifts towards the lens
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Solution
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As the image formed by a large number of rays from the object. So, if any part of the lens is blackened, the image will form. The brightness of image will be less compared to the image formed by without blackened the lens. So, If the upper half of the lens is blackened then the brightness of the image reduces.
Hence, option D is correct.

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Q1
A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then
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Q2
A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under :

Position of candle =12.0 cm
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Position of the screen =88.0 cm

What will be the nature of the image formed if he further shifts the candle towards the lens?

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Q3
A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen.
a) Half of the image will disappear
b) No part of image will disappear
c) Intensity of the image will increase
d. Intensity of the image will decrease
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Q4

A student focuses the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as shown below
Position of candle = 12.0 cm
Position of convex lens = 50.0 cm
Position of the screen = 88.0 cm
(i) What is the focal length of the convex lens?
(ii) Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?
(iii) What will be the nature of the image formed if he further shifts the candle towards the lens?
(iv) Draw a ray diagram to show the formation of the image in case (iii) as said above.

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Q5
A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle, screen and the lens with metre scale as under:
Position of candle =12.0 cm
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Position of the screen =88.0 cm
Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm ?

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