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Image in Thin Lens by Ray Tracing

A student foc...

Question

A student focussed the image of a candle flame on a white screen using a lens. He noted down the position of the candle screen and the lens as mentioned below:
Position of candle = 12.0 cm
Position of lens = 50.0 cm
Position of the screen = 88.0 cm

(i) What type of device is used?

A

Convex lens

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B

Cconcave lens

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C

Plane mirror

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D

Glass slab

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Solution

The correct option is A Convex lens
As the image is formed on a screen, it is real. A real image cannot be formed by a concave lens. Only convex lens can produce real images.

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Similar questions

Q. A student focussed the image of a candle flame on a white screen using a lens. He noted down the position of the candle screen and the lens as mentioned below:
Position of candle = 12.0 cm
Position of lens = 50.0 cm
Position of the screen = 88.0 cm

(ii) What is the focal length of the lens used?

Q. A student focussed the image of a candle flame on a white screen using a lens. He noted down the position of the candle screen and the lens as mentioned below:
Position of candle = 12.0 cm
Position of lens = 50.0 cm
Position of the screen = 88.0 cm

(iv) Nature of image if he shift the candle between 12 cm and 31 cm?

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 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 student focused the image of a candle flame on a white screen using a lens. He noted down the position of the candle screen and the lens as mentioned below:
Position of candle = 12.0 cm
Position of lens = 50.0 cm
Position of the screen = 88.0 cm

(iii) What is the nature of the image? Is it enlarged?

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