Relationship between Focus and Radius of Curvature

Q.

The radius of curvature of a convex mirror is 40 cm. Find its focal length.

Q.

Question 1
Find the focal length of a convex mirror whose radius of curvature is 32 cm.

Q.

The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

1. 20 cm

2. 10 cm

3. 30 cm

4. 40 cm

Q.

The focal length of a concave mirror is 10 cm. Find its radius of curvature.

Q.

Define the term ‘Radius of curvature’

Q.

What is the focal length of a concave mirror with a radius of curvature of 16.0 cm?

Q. Find the focal length of a convex mirror whose radius of curvature is 32 cm.

Q. Label the parts on the concave mirror.

1. Pole
2. Focus
3. Principal axis
4. Centre of curvature

Q.

If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length?

1. 20 cm, 10 cm

2. 40 cm, 10 cm

3. 20 cm, 20 cm

4. 40 cm, 5 cm

Q.

If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length of the spherical glass?

1. 40 cm, 10 cm

2. 20 cm, 20 cm

3. 40 cm, 5 cm

4. 20 cm, 10 cm

Q. \N

1. R =1/2 F

2. R = F

3. R = 2F

4. F=1/2R

Q.

Which of the following relations hold good where F is the focal length and R is the radius of curvature.

1. R = F

2. F = $\frac{R}{2}$

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

4. F = 2R

Q. Focal length of a lens made of glass does not depend on_______.

1. refractive index of the glass
2. radius of curvature of the surfaces
3. refractive index of surrounding
4. intensity of incident rays

Q. Label the parts on the concave mirror.

1. Pole
2. Focus
3. Principal axis
4. Centre of curvature

Q. ___ is the linear distance between the pole and principal axis.

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

1. Half of radius of curvature
2. Height of the mirror
3. Object distance
4. Radius of curvature