Which of the following figures will depict deviation of a ray of light through 90° when it emerges out of the prism.

1.

2.

3.

4.

Which of the following values can represent the magnification of a simple microscope?

1. +1
2. –1
3. +2
4. –2

Assertion (A) : Quartz prism is used to study ultraviolet spectrum.

Reason (R) : Quartz does not absorb ultraviolet radiations.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true and (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false and (R) is true.

The amplitude of a sound wave is reduced from 2 mm to 1 mm. The intensity of the sound will:

1. become four times the initial
2. remain the same
3. become half of the initial
4. become one fourth of the initial