Question

To obtain image of an object on a screen we require a
A) comvex lens
B) concave lens
c) concave lens of large focal length
D)Concave lens of small focal length

Answer 1

Answer:

To obtain image of an object on a screen we require a

concave lens of large focal length

Answer 2

Answer:

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c) concave lens of large focal length

Extra information:-

For an object at infinity, all the paraxial rays after reflection from the concave mirror will pass through the focus, thus the image is formed at focus. Hence the focal length of the concave mirror can be determined by measuring the distance between the screen and the mirror.