Hi May i know why is the ans 1? Thanks

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primary 5 | Science
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primary 5 Science Singapore

Hi
May i know why is the ans 1?
Thanks

Date Posted: 5 years ago

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since the plastic with the triangle cut out is clear? when put together with the wooden block (with the circle cut out) blue light will shine through with the triangle outline in the middle

Date Posted: 5 years ago

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5 years ago

Thanks!
But i don quite understand -- the clear plastic block got a triangle cut out, hence most light will pass through THE BLOCK as well as the TRIANGLE right? How/why the triangle outline shown?

Amirah Nurhuda

5 years ago

no no the block is opaque so nothing passes through it. hence light will just pass through the circle and since there is a triangle cutout, you can see the outline of the triangle as well

5 years ago

The plastic block (with triangle) is "clear plastic" as mentioned in qn right?

Opaque is the wooden one with circle.

Amirah Nurhuda

5 years ago

oh okok i think i get what you’re confused about. do you feel that the outline shouldn’t be seen since the plastic block is clear?

5 years ago

Yes u are right!
Cos it's a clear plastic block meaning it allow most light to pass through. So why got the triangle outline?

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