Assertion A hollow lens behaves like a thin glass plate.
Reason Power of this lens becomes zero.

Options

A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If Assertion is false but Reason is true.

Explanation

To solve the question regarding the assertion and reason about a hollow lens, we can follow these steps:

### Step 1: Understand the Concept of a Hollow Lens
A hollow lens is a lens that is empty inside, meaning it has no material in its center. It can be thought of as a lens with air or vacuum inside. The refractive index of the hollow lens will be the same as that of the surrounding medium (usually air).

**Hint:** Consider the refractive index of the materials involved when analyzing the behavior of the lens.

### Step 2: Apply the Lensmaker's Formula
The lensmaker's formula is given by:
\[ \frac{1}{f} = (\mu - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \]
where \( f \) is the focal length, \( \mu \) is the refractive index of the lens material, and \( R_1 \) and \( R_2 \) are the radii of curvature of the lens surfaces.

**Hint:** Remember that for a hollow lens, the refractive index (\( \mu \)) is equal to that of the surrounding medium.

### Step 3: Analyze the Focal Length of the Hollow Lens
For a hollow lens, if the refractive index of the lens is the same as the surrounding medium (air), then:
\[ \mu = 1 \]
Substituting this into the lensmaker's formula, we get:
\[ \frac{1}{f} = (1 - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) = 0 \]
This implies that the focal length \( f \) is infinite.

**Hint:** An infinite focal length indicates that the lens does not converge or diverge light rays.

### Step 4: Determine the Power of the Lens
The power \( P \) of a lens is given by the formula:
\[ P = \frac{1}{f} \]
Since we found that \( f \) is infinite, the power becomes:
\[ P = \frac{1}{\infty} = 0 \]

**Hint:** Recall that power is a measure of how strongly a lens converges or diverges light.

### Step 5: Relate the Hollow Lens to a Thin Glass Plate
A thin glass plate does not converge or diverge light; it simply transmits it. Since the hollow lens behaves similarly (with power zero), it can be said to act like a thin glass plate.

**Hint:** Consider how light behaves when passing through different optical elements.

### Conclusion
Both the assertion and reason are true. The hollow lens behaves like a thin glass plate, and its power is indeed zero.

**Final Answer:** Both the assertion and reason are true, and the reason is the correct explanation of the assertion.