Question
Why is there no dispersion in the light refracted through a rectangular glass slab?
✓
Answer
It can be considered to be equivalent to two prisms in reverse way. In the case of a rectangular glass slab the rays of all colours combine together in the reverse prism. Hence, there is no dispersion.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
How the radii of different stable orbits are related to principal quantum number?
Two point charges, q1 = 10 × 10–8 C and q2 = – 2 × 10–8 C are separated by a distance of 60 cm in air.
- Find at what distance from the 1st charge, q1 would the electric potential be zero.
- Also calculate the electrostatic potential energy of the system.
What is paramagnetic substance?
The magnetic properties of the different materials A, B and C are shown in the following table:
Which of the above three materials should be used for making an electromagnet and why?
| Material | Permeability | Susceptibility | Temperature dependence of susceptibility. |
| A | Low positive | Small but negative | Independent of temperature |
| B | High | Very high 1 | Susceptibility decreases with temperature |
| C | Greater than 1 | Small but positive | Decreases with temperature |
Figure, shows two coherent sources S1 and S2 which emit sound of wavelength $\lambda$ in phase. The separation between the sources is $3\lambda.$ A circular wire of large radius is placed in such a way that S1S2 lies in its plane and the middle point of S1S2 is at the centre of the wire. Find the angular positions $\theta$ on the wire for which constructive interference takes place.
→The coil of a moving-coil galvanometer keeps on oscillating for a long time if it is deflected and released. If the ends of the coil are connected together, the oscillation stops at once. Explain
The separation between a node and the next antinode in a vibrating air column is 25cm. If the speed of sound in air is 340m/s, find the frequency of vibration of the air column.
Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at 0°C. Use the data in the table.
| |||||||||||||||||||||||||||
|
Answer the following questions:
In any ac circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?
In any ac circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?
An electron moves in a circular orbit $6^{15} \times 10^{15}$ times per second. Find the magnitude of current in the loop.
→