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प्रश्न
Draw a ray diagram to show how a converging lens can form an image of the sun. Hence give a reason for the term ‘burning glass’ for a converging lens used in this manner.
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उत्तर
The sun is at infinity, so the convex lens forms its image at the second focal point, which is real and very much diminished in size.
While using the convex lens as burning glass, the rays of light from the sun (at infinity) are brought to focus on a piece of paper kept at the second focal plane of the lens. Due to the sufficient heat of the sun's rays, the paper burns. Hence, this lens is termed 'burning glass'.
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संबंधित प्रश्न
A lens forms an erect, magnified, and virtual image of an object. Draw a labelled ray diagram to show the image formation.
A converging lens forms the image of an object placed in front of it beyond 2F2 of the lens. Where is the object placed?
A converging lens forms the image of an object placed in front of it, beyond 2F2 of the lens. State three characteristics of the image.
A lens forms an inverted image of an object. What is the nature of the image real or virtual?
An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ______.
An object is placed at a distance 2f from a convex lens of focal length f. The size of the image formed is ______ that of the object.
An object is placed at a distance 5 cm from a convex lens of focal length 10 cm. The image formed is virtual, upright and _____.
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
An object is placed at a distance 20cm from a convex lens of focal length 10cm. Find the image distance and nature of the image.
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
Position of convex lens = 50.0 cm
Position of the screen = 88.0 cm
- What is the focal length of the convex lens?
- Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?
- What will be the nature of the image formed if he further shifts the candle towards the lens?
- Draw a ray diagram to show the formation of the image in case (iii) as said above.
