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Physics Light Questions

1.Parallel rays from a distant object diverge on passing through a lens,Which of the following are correct?

(1)The lens is concave,

(2)The image formed is vistual,

(3)Image distance is equal to focal length.

A.(1)and(2)only.

B.(1)and(3)only.

C.(2)and(3)only.

D(1),(2),(3)

2 http://i19.photobucket.com/albums/b159/thisbe_boes...

Could u please show the solution as well????

Thx a lot...

1 Answer

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  • 1 decade ago
    Favorite Answer

    1

    (1) concave lens is a converging lens

    (2)image formed by concave lens is always virtual

    (3)the image formed by concave lens is always diminished

    Ans: A

    2

    冇scaner大約講俾你聽點畫

    ray through optic centre(for both concave & convex lens)>>no change in dir

    a)throgh focus>> parallel to principal axis

    b)唔識

    c)去番2f'

    d)中間條ray 直去

    throgh focus>>parallel to prncipal axis

    e)parllel>>throgh F

    throgh optic centre>>no change

    跟住你搵個intersection 將第三條連過去就得

    f) 好似(e)咁做

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