Question

Assertion (A): Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen.

Reason (R): The glass piece is not seen on changing the temperature of liquid, when the refractive index of liquid becomes equal to the refractive index of glass.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Explanation:

At a particular temperature, a glass piece immersed in a liquid completely disappears from view. This happens because when the refractive indices of the liquid and the glass become exactly equal, light does not bend or reflect at their boundary, making the glass piece entirely indistinguishable from the surrounding liquid.