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

Only half of the image will be visible

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The image position shifts towards the lens

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The image position shifts away from the lens

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The brightness of the image reduces

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Solution

The correct option is B The brightness of the image reduces
To form a image only two rays are needed .The total amount of light released by the object is not allowed to pass through the lens, intensity of image will decrease

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Similar questions

Q. 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 c m

Position of convex lens

= 50.0 c m

Position of the screen

= 88.0 c m

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

Q. 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

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.

Q. 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 c m

Position of convex lens

= 50.0 c m

Position of the screen

= 88.0 c m

Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm ?

Q. A convex lens forms a real image three times larger than the size object on a screen. Object and screen are moved until the image becomes twice the size of the object. If the shift of the object is

6 cm

(away from the lens), the shift of screen is :

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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

The correct option is B The brightness of the image reducesTo form a image only two rays are needed .The total amount of light released by the object is not allowed to pass through the lens, intensity of image will decrease

The correct option is B The brightness of the image reduces
To form a image only two rays are needed .The total amount of light released by the object is not allowed to pass through the lens, intensity of image will decrease