Out of the two Media – Medium 1 and Medium 2, in which is the speed of light more?
The speed of light is more in Medium 1 as the refracted ray bends away from the normal when it enters Medium 2, which suggests that the speed of light in Medium 1 is higher.
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |
State reason of bending of the refracted ray away from the normal.
Express refractive index of Medium 2 with respect to Medium 1 in terms of speed of light in two media.
Give reasons:
(i) The sky appears dark to passengers flying at very high altitudes.
At very high altitudes, passengers are above the atmosphere where there is less scattering of sunlight. As a result, they do not see the scattered blue light and the sky appears dark, similar to the condition experienced by astronauts in space.
(ii) 'Danger' signal lights are red in color.
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |