Science
A ray of light starting from the air passes through medium A of refractive index 1.50, enters medium B of refractive index 1.33 and finally enters medium C of refractive index 2.42. If this ray emerges out in the air from C, then for which of the following pairs of media the bending of light is least?
- air-A
- A-B
- B-C
- C-air
Answer
A-B
Reason — The bending of light is least when the refractive index change is least. When light is travelling from medium A to medium B, the change in refractive index is from 1.50 to 1.33 which is the least in this case. Hence, the bending of light is also the least for A-B.
Related Questions
A student wants to obtain a magnified image of an object AB as on a screen. Which one of the following arrangements shows the correct position of AB for him/her to be successful?
1.
2.
3.
4.
The following diagram shows the use of an optical device to perform an experiment of light. As per the arrangement shown, the optical device is likely to be a;
- Concave mirror
- Concave lens
- Convex mirror
- Convex lens
Which of the following statements is not true for the scattering of light?
- Colour of the scattered light depends on the size of particles of the atmosphere.
- Red light is least scattered in the atmosphere.
- Scattering of light takes place as various colours of white light travel with different speeds in air.
- The fine particles in the atmospheric air scatter the blue light more strongly than red. So the scattered blue light enters our eyes.
For the diagram shown, according to the new cartesian sign convention the magnification of the image formed will have the following specifications :
- Sign — Positive, Value — Less than 1
- Sign — Positive, Value — More than 1
- Sign — Negative, Value — Less than 1
- Sign — Negative, Value — More than 1