MCQ
A passenger in an aeroplane shall:
- ANever see a rainbow.
- BMay see a primary and a secondary rainbow as concentric circles.
- CMay see a primary and a secondary rainbow as concentric arcs.
- DShall never see a secondary rainbow.
✓
Answer
- May see a primary and a secondary rainbow as concentric circles.
Solution:
As aeroplane is at higher altitude, the passenger in an aeroplane may see a primary and a secondary rainbow like concentric circles.
Key Concept:
- If an object move with constant speed (V0) towards a convex lens from infinity to focus, the image will move slower in the beginning and then faster. Also $\text{V}_\text{i}=\Big(\frac{\text{f}}{\text{f}+\text{u}}\Big)^2\text{V}_0$.
- If an object approaches the lens, the image moves away from lens with a non-uniform acceleratiion.
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