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प्रश्न
Fill in the following blank with suitable word:
Lenses refract light to form images: a..................... lens can form both real and virtual images, but a diverging lens forms only ...................... images.
उत्तर
Lenses refract light to form images: a converging lens can form both real and virtual images, but a diverging lens forms only virtual images.
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संबंधित प्रश्न
An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:
(a) upright and magnified
(b) inverted and magnified
(c) inverted and diminished
(d) upright and diminished
Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
Construct ray diagrams to illustrate the formation of a virtual image using a diverging lens.
When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at he focus of:
(a) either a convex mirror or convex lens
(b) either a concave mirror or concave lens
(c) either a concave mirror or convex lens
(d) either a convex mirror or concave lens
An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm. Fine the position and nature of the image.
State whether the following statement is true or false:
Short-sightedness can be cured by using a concave lens.
Give two characteristic of the image formed by a concave lens.
Explain the working of an astronomical telescope using refraction of light.
Draw images in case of a concave lens when the object is at infinity.
Draw images in case of a concave lens when the object is at any point on the principal axis between the lens and infinity.
