A mixed laser beam containing green (λ≈532 nm\lambda \approx 532\text{ nm}λ≈532 nm) and violet (λ≈405 nm\lambda \approx 405\text{ nm}λ≈405 nm) light is directed from air into a heavy flint glass block. Inside the glass, the green light refracts less than the violet light.
Which statement correctly explains this difference in wave behaviour?
The frequency of green light decreases by a smaller factor than the frequency of violet light upon entering the glass block.
Green light experiences a smaller decrease in speed than violet light upon entering the glass block.
Green light experiences a larger decrease in speed than violet light upon entering the glass block.
Green light increases in speed, while violet light decreases in speed upon entering the glass block.
43 exam-style questions on OCR GCSE Physics Wave behaviour. Each one has a worked solution and a mark scheme showing where the marks go.