Edexcel gcse (9 1) physics sp5 light and the electromagnetic spectrum test with mark scheme 16 17-key points

2. Question 1(b)(ii)
The density of the glass coating is less than the
density of the glass core.
Remember…

3. Question 1(b)(iii)
• angle of incidence < critical angle [1 mark]
• no TIR / light only refracted / moves out of the
glass [1 mark]
• thus reflected light weaker (or similar) [1
mark]

4. Question 2(a)(i)

5. Question 2(a)(ii)

6. Question 2(b)(i)
Correct statement [1 mark]
f of blue > f of red [1 mark]
blue bends more than red [1 mark]

7. Question 2(b)(ii)
• Colours bend differently / have different
speeds / different refraction etc. [1 mark]
• Do not focus on a single point [1 mark]

8. Question 3
Vocabulary check:
transmitted = passes
absorbed = stopped