If
a light passes through a small pinhole, and incident on a screen.
What will be observed on the screen?
A: A
sharp bright point of the width equal to width the pinhole
B: A
bright point of the width equal to width the pinhole but of less
intensity
C: A
bright ring at the center surrounded by alternate dark and bright
rings
D: A
diffused bright point
a light passes through a small pinhole, and incident on a screen.
What will be observed on the screen?
A: A
sharp bright point of the width equal to width the pinhole
B: A
bright point of the width equal to width the pinhole but of less
intensity
C: A
bright ring at the center surrounded by alternate dark and bright
rings
D: A
diffused bright point
举一反三
- ( )system<br/>interact with environment strongly. A: Open B: Close C: Bright D: Dark
- Seeing him, she<br/>seemed to ______ a little. (bright)
- In any case, the (()impressions<br/>of childhood and…liein<br/>the<br/>memory. A: bright B: transparent C: clean D: clear
- Work hard, ____ you will<br/>have a bright future. A: and B: or C: since
- 设置水平线居中，宽度为50%，颜色是红色的网页编码是（ ）。 A: <;br align="center" width="50%" color="red"/>; B: <;hr align="center" width="50%" color="red"/>; C: <;hr align="center" width="50%" color="red">;<;/hr>; D: <;br align="center" width="50%" color="red">;<;/br>;