Explain it

05.05 โ€” 1 short write-up

A checkpoint, not a test

Explain a negative image distance

Use the sign convention from this lesson, not just 'it's virtual.'

You solve a lens problem and get dแตข = โˆ’22 cm. A friend says you made a mistake because distances can't be negative. Explain why this answer is correct and what it tells you about the image.

Say what a negative dแตข means for a lens specifically (which side the image is on and whether it's real or virtual), not just that negative numbers are allowed.