1. Why is it that when you put a newspaper in the mirror it shows up backwards, but when you stand in the mirror with both hands up your right hand is on your right side and your left is on your left? Why aren't they reversed?
2. I was wondering about wave/vibration/frequency theory. Light requires no medium - yes? Is there a threshold or frequency below which a medium is required, such as in the case of sound?
3. For a given focal length, from what distance does
the light travel parallel to the lens. What is meant by "infinity" for a lens and how do we calculate it for a lens of particular focal length?
4. What is the exact relation of the focal length to the center of curvature.
5. If the light comes from infinity (if we consider light from sun), it forms a point size image at its focal length; but in case of an object nearer to the lens(take for example, the image formed on the lens of a camera) it does't form a point image but forms an image of some particular size. Can u explain. Can u explain what distance is considered to be infinity for a lens of particular focal length.
6. When driving at night, one can adjust the rear view mirror so that the lights from trailing cars do not shine so brightly in the driver's eyes'. However, if left in this position and used during daytime, the mirror is aimed at the back seat of the car. How can one see behind himself at night when in reality he is looking at the back seat? I understand that when looking at the rear view mirror in the normal position, the light from the trailing car bounces off the mirror and reflects into the driver's eyes, thus allowing him to see who is behind him. But if the mirror is pointed at the back seat, how can the headlights of trailing cars be seen?
7. What relationship does light have with a camera, a rainbow, a mirror and water?
8. An object, placed 20cm from a convex lens, forms a magnified clear image on a screen. When the lens is moved 20 cm towards the screen, a smaller clear image is form on the screen. Calculate the focal length of the lens.
9. A lamp and a screen are 80 cm apart and a coverging lens placed midway between them produces a clear image I on the screen. A diverging lens is now placed between the lamp and converging lens, the distance from the lenses being 30 cm. Then the lamp is moved away so that it is 30 cm from the diverging lens and the clear image I reappears on the screen. Find the focal length of the diverging lens.
10. What is the Raman Effect?
When light waves travel from air to glass, which one of the following happens to the frequency and wavelength of the light?
Plane wavefronts approach an interface between two media at an angle.
What is the relation between focal length and infinity, and center of curvature and infinity.
In case of a camera, is it the neearest distance from which we can photograph an object, the infinity of the lens?
Frequency
Wavelength
A
stays the same
decreases
B
decreases
increases
C
stays the same
increases
D
increases
decreases
If the speed of the waves in medium 2 is greater than in medium 1, which of the labelled sets in the diagram (click here to see the diagram) best shows the wavefronts in medium 2?
A A B B C C D D
