Answer :

i. A. **Pole**-The center of the reflecting surface of a spherical mirror is a point called the pole. It lies on the surface of the mirror. The pole is usually represented by the letter P.

B. **Center of curvature-**The reflecting surface of a spherical mirror forms a part of a sphere. This sphere has a center. This point is called the center of curvature of the spherical mirror. It is represented by the letter C.

C. **Principle Axis**- The imaginary line which connects the pole to the center of curvature is called the principle axis.

D. **Principal Focus**- A number of rays parallel to the principal axis are falling on a spherical, reflected rays are all meeting/intersecting (or intersects when extended backwards and/or forward) at a point on the principal axis of the mirror. This point is called the principal focus of the concave mirror

ii. A. **Concave mirror**

B. **Convex Mirror**

i. The mirror is concave mirror as a concave mirror makes a magnified virtual image of the object when it is placed between the focus and pole of the mirror. The image is virtual, erect and magnified.

**OR Part**

i.

ii.

The lens formula is

where v is the image distance, u is the object distance, f is the focal length (both as per the sign convention). For the above situation the formula can be written as,

iii. **The data given is:**

the object distance is, ,

the magnification is, m,

we know that the magnification for lens is given by the formula ,

, where,

V is the image distance, u is the object distance, h_{o} is the object size and h_{i}is the image size.

Calculations:

So, after substituting the data we have,

So, we get .

So using the lens formula we can obtain the focal length of the lens

, where the symbols have the usual meanings.

Substituting the given and founded data, we can write,

So, f = 10 cm

We know that power of a lens is the reciprocal of the focal length in metes,

.

**P = 10 D.**

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