Center of Curvature and Radius

Q. The radius of curvature of a concave mirror is $10cm$. If I want to capture the image of the sun, at what distance from the pole of the mirror would an image be formed?

1. $20cm$
2. At infinity
3. $10cm$
4. $5cm$

Q. If 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of that mirror, then which of the following is true?

1. $R=\frac{F}{2}$
2. $F=\frac{R}{2}$
3. $F=R$
4. $F=\frac{R}{3}$

Q.

The focal length of a convex lens is $20cm$, the focal length of the concave mirror is $30cm$. And the separation between lens and mirror is $90cm$. If the object is placed $60cm$ before the lens, find out the position of an image formed by the concave mirror?

1. 60 cm from point B

2. 90 cm from point B

3. 60 cm from point A

4. 60 cm left of lens

Q. Distance between focus and centre of curvature is equal to .

1. half of the radius
2. radius of curvature
3. height of the mirror

Q. An object of length $4cm$ is placed in front of a concave mirror at a distance of $30cm$. The focal length of mirror is $15cm$. What will be the length of image?

1. $1cm$
2. $2cm$
3. $4cm$
4. $6cm$

Q. Distance between focus and centre of curvature is equal to .

1. height of the mirror
2. radius of curvature
3. half of the radius

Q. An object is placed at $15\text{cm}$ in front of a convex mirror with radius of curvature $30\text{cm}$. Where will the image form?

1. Infinity
2. $1.85\text{cm}$
3. $-1.85\text{cm}$
4. $3.75\text{cm}$

Q.

Distance between focus and centre of curvature is equal to ______.

1. Object distance

2. Half of radius of curvature

3. Radius of curvature

4. Height of the mirror

Q. The radius of curvature of a concave mirror is $12\text{cm}$. If we want to capture the image of the sun, at what distance from the pole of the mirror would an image be formed?

1. $6\text{cm}$
2. $0\text{cm}$
3. $12\text{cm}$
4. $9\text{cm}$

Q. Distance between focus and centre of curvature is equal to .

1. height of the mirror
2. half of the radius
3. radius of curvature

Q. Where would the image form, if the object is placed at a finite distance from a concave lens?

1. Between F and O
2. At O
3. At F
4. Between C and F

Q. What are examples of such mirrors whose aperture is smaller than radius of curvature??

Q. A ray through the Centre of Curvature hitting the spherical mirror makes an angle of ___ with the normal.

1. ${90}^{\circ }$
2. ${180}^{\circ }$
3. $0^{\circ }$
4. ${45}^{\circ }$

Q. If 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of that mirror, then which of the following is true?

1. $R=\frac{F}{2}$
2. $F=\frac{R}{2}$
3. $F=R$
4. $F=\frac{R}{3}$

Q. Distance between focus and centre of curvature is equal to .

1. height of the mirror
2. half of the radius
3. radius of curvature