A : Light coming from numbers of calculator.s L.C.D display is polarised.
R : The reflected light cannot be polarized when light is incident normal to the plane surface.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true and R is false
D. Both A and R are false

Answer

To analyze the statements given in the question, we need to evaluate both the assertion (A) and the reason (R) provided:

**Assertion (A):** Light coming from numbers of calculator's LCD display is polarized.

**Reason (R):** The reflected light cannot be polarized when light is incident normal to the plane surface.

### Step-by-Step Solution:

1. **Understanding Polarization of Light:**
- Polarization refers to the orientation of the oscillations of light waves. In unpolarized light, the oscillations occur in multiple planes, while in polarized light, the oscillations are restricted to a single plane.

2. **Analyzing the Assertion (A):**
- The light emitted from an LCD (Liquid Crystal Display) is indeed polarized. This is because the liquid crystals in the display manipulate the light in such a way that it vibrates in a specific direction. Therefore, the assertion is **true**.

3. **Analyzing the Reason (R):**
- The reason states that reflected light cannot be polarized when light is incident normally (at a 90-degree angle) to the surface. This is also true. When light hits a surface at a normal incidence, it reflects back without any change in its polarization state. Thus, the reflected light remains unpolarized.

4. **Evaluating the Relationship Between A and R:**
- While both the assertion and the reason are true, the reason does not correctly explain the assertion. The polarization of light from an LCD display is due to the nature of the display itself, not directly related to the behavior of reflected light at normal incidence.

5. **Conclusion:**
- Both the assertion (A) and the reason (R) are true statements, but R is not the correct explanation for A. Therefore, the answer is that both A and R are true, but R does not explain A.

### Final Answer:
Both A and R are true, but R is not the correct explanation of A.

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