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प्रश्न
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
विकल्प
A convex lens of focal length 5 cm
A concave lens of focal length 5 cm
A convex lens of focal length 10 cm
A concave lens of focal length 10 cm
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उत्तर
A convex lens of focal length 5 cm
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संबंधित प्रश्न
A lens forms an upright and diminished image of an object when the object is placed at its focal point. Name the lens and draw a 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.
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 _____.
For the object placed between the optical centre and focus of a convex lens, the image is ______.
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce
Explain the rules for obtaining images formed by a convex lens with the help of ray diagram.
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.
Complete the following table based on image formation by convex lens:
| Position of Object | Position of Image | Nature of Image |
| At infinity | (a) ______ | Real and inverted and highly diminished image |
| Beyond 2F1 | (b) ______ | (c) ______ |
| At 2F1 | (d) ______ | Real, inverted, same size (as object) image |
| Between F1 and 2F1 | Beyond 2F2 | (e) ______ |
| At focus F1 | (f) ______ | Real, inverted and highly enlarged image |
A lens forms an upright and magnified image of an object. Draw a labelled ray diagram to show the image formation.
