The refractive index of medium A is 1.5 and that of medium B is 1.33. If the speed of light in the air is 3 × 10⁸ m/s, what is the speed of light in medium A and B respectively?

(a) 2 × 10⁸ m/s and 1.33 × 10⁸ m/s

(b) 1.33 × 10⁸ m/s and 2 × 10⁸ m/s

(c) 2.25 × 10⁸ m/s and 2 × 10⁸ m/s

(d) 2 × 10⁸ m/s and 2.25 × 10⁸ m/s

50.0 mL of tap water was taken in a beaker. Hydrochloric acid was added drop by drop to water. The temperature and pH of the solution was noted. The following graph was obtained. Choose the correct statements related to this activity.

(i) The process of dissolving an acid in water is highly endothermic.

(ii) The pH of the solution increases rapidly on addition of acid.

(iii) The pH of the solution decreases rapidly on addition of acid.

(iv) The pH of tap water was around 7.0.

1. (i) and (ii)
2. (i) and (iii)
3. (iii) and (iv)
4. (ii) and (iv)

Which of the following statements is not true in reference to the diagram shown below?

1. Image formed is real.
2. Image formed is enlarged.
3. Image is formed at a distance equal to double the focal length.
4. Image formed is inverted.

In the diagram shown below n₁, n₂ and n₃ are refractive indices of the media 1, 2 and 3 respectively. Which one of the following is true in this case?

1. n₁ = n₂
2. n₁ > n₂
3. n₂ > n₃
4. n₃ > n₁