# Bong do - Bng(Bng ng Bng c hiu l bng ca mt vt th n chnh l...

• Test Prep
• JohnyChanee
• 4

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Bóng đổ (Bóng ng ) Bóng đổ đượ c hi u là bóng c a m t v t th , nó chính là bóng đ en theo hình dáng, kích th ướ c c a v t th đượ c ngu n sáng chính (l ư u ý là ngu n sáng chính) h t ra theo h ướ ng chi ế u c a ngu n sáng. Trong toán h c ng ườ i ta g i là "hình chi ế u", thông th ườ ng chúng ta ch h c hình chi ế u vuông góc (góc chi ế u b ng 90 độ ) mà thôi. Trong khi đ ó th c t ế l i là m t s hoàn toàn không bi ế t tr ướ c. Bóng đổ đ ôi khi c ũ ng đượ c g i là "Bóng ng ". Cái hay c a "bóng đổ " là hình dáng c a chúng ph thu c vào b m t n ơ i bóng xu t hi n, để đơ n gi n tôi t m g i là "m t đổ bóng: M Đ B . M Đ B càng ph ng (m t có
th n m ho c đứ ng (nh ư b c t ườ ng)) thì bóng đ en càng in rõ lên M Đ B, nh ư ng n

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• Summer '14

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