How to do for these two question?Pls help

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secondary 4 | Biology
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secondary 4 Biology

How to do for these two question?Pls help

Date Posted: 6 years ago

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Date Posted: 6 years ago

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Lim Jing Yu

6 years ago

why the angle is 45°－30°?

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Date Posted: 6 years ago

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Lim Jing Yu

6 years ago

thank you

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clear {{ downvoteCount * -1 }} Downvotes

Date Posted: 6 years ago

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Lim Jing Yu

6 years ago

Is the upright image must use the symbol（－）?

Arnold K H Tan

6 years ago

As in the diagram. Upright images are virtual and on the same side as the object, so v = -0.30 m. If its a normal case with a real image on the other side of the lens, v = positive number. This should have been taught by your Physics teacher. Very fundamental knowledge.