1. In an expert laboratory experiment, a student places a candle $2 \text{ m}$ away from a pinhole camera. If the camera length is $10 \text{ cm}$, the magnification of the image formed is:
2. During a total solar eclipse, why is the 'path of totality' so narrow compared to the overall shadow of the Moon?
3. An object is placed between a light source and a screen. If the object is moved exactly to the midpoint, what happens to the umbra and penumbra?
4. Why do shadows cast by the Sun at noon appear much shorter than those cast in the evening?
5. "Bioluminescence" in deep-sea creatures is an example of an expert adaptation to an environment where:
6. A pinhole camera produces a blurred image if the hole is enlarged because:
7. An "Annular Solar Eclipse" occurs specifically when:
8. The speed of light in water is approx $2.25 \times 10^8 \text{ m/s}$. This suggests that light:
9. If you hold a red glass in front of a white light source, the light coming out is red because the glass:
10. A point source of light creates a sharp shadow with ________ only.
11. Light rays from a distant star reaching Earth are considered to be:
12. Shadows formed by sunlight under a leafy tree appear as several small circular spots. These are actually:
13. The time taken by light from the Sun to reach Earth is approximately:
14. In a Lunar Eclipse, the Moon appears reddish. This expert phenomenon is due to:
15. Why can't we see a candle flame if we look through a bent pipe?
16. If the umbra of a shadow is very small compared to the penumbra, the light source is likely:
17. A "Light Year" is a unit used to measure:
18. Translucent objects are those which ________ light.
19. The shadow of a bird flying very high is not seen because its umbra ________.
20. In a Total Solar Eclipse, the Moon covers the Sun's ________ completely.
