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प्रश्न
What type of lens is used to correct
myopia?
उत्तर
Concave lenses are used to correct myopia.
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संबंधित प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
virtual, upright and larger than the object?
How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light.
Which type of lenses are:
thinner in the middle than at the edges?
State one practical use each of convex mirror, concave mirror, convex lens and concave lens.
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the focal length of lens B?
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the nature of lens A?
Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.
Give two characteristic of the image formed by a concave lens.
How will you differentiate between a convex and a concave lens by looking at
- a distant object,
- a printed page?
Express power of a concave lens of focal length 50 cm with its sign.
