1. | yellow, orange, and red |
2. | blue, green, and yellow |
3. | orange, red, and violet |
4. | all of the above |
1. | x4 | less than
2. | x4 but less than x2 | more than
3. | x2 |
4. | x4 |
(a) | the distance between the objective and the eyepiece is 20.02m. |
(b) | the magnification of the telescope is −1000. |
(c) | the image of the planet is erect and diminished. |
(d) | the aperture of the eyepiece is smaller than that of the objective. |
1. | (a), (b), and (c) | 2. | (b), (c), and (d) |
3. | (c), (d), and (a) | 4. | (a), (b), and (d) |
1. | primary rainbow is due to double internal reflection and is formed above the secondary one. |
2. | primary rainbow is due to double internal reflection and is formed below the secondary one. |
3. | secondary rainbow is due to double internal reflection and is formed above the primary one. |
4. | secondary rainbow is due to a single internal reflection and is formed above the primary one. |
A beam of light is incident vertically on a glass slab of thickness 1 cm, and refractive index 1.5. A fraction A is reflected from the front surface while another fraction B enters the slab and emerges after reflection from the back surface. The time delay between them is:
1. | 10−10 s | 2. | 5×10−10 s |
3. | 10−11 s | 4. | 5×10−11 s |