Một miếng gỗ hình tròn, bán kính 4 (cm). Ở tâm O, cắm thẳng góc một đinh OA. Thả miếng gỗ nổi trong một chậu nước có chiết suất n = 1,33. Đinh OA ở trong nước, cho OA = 6 (cm). Mắt đặt trong không khí sẽ thấy đầu A cách mặt nước một khoảng lớn nhất là:

A. OA’ = 3,64 (cm). B. OA’ = 4,39 (cm). C. OA’ = 6,00 (cm). D. OA’ = 8,74 (cm).

Mắt nhìn thấy A một khoảng xa mặt nước nhất có nghĩa là tia sáng lò ra ngoài phải có góc khúc xạ nhỏ nhất.

Chính là tia chiếu đến rìa của tấm gỗ

$tan\alpha=\frac46=\frac23$

Góc khúc xạ

$sin\beta=1.33sin\alpha$

$\beta\approx47.7^o$

$OA'=r.tan(\pi/2-\beta)\approx3.64cm$

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