True/FalseEasy1 mark
4(ii)
A rectangular glass block of refractive index 1.5 has an air bubble trapped inside it as shown in the diagram. When seen from the surface AB, it appears to be 4 cm deep.
Turning the glass block upside down, DOES NOT change the apparent depth of the air bubble. State True or False.
Topic: Apparent depth after inversion
Question wording verified against source paper
Answer
Exam answer
False.
Explanation
After inversion, real depth = 15 − 6 = 9 cm and apparent depth = 9/1.5 = 6 cm, not 4 cm.
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