Question

Choose the correct pair.

a. Centre of curvature	i. Effective diameter of the circular outline of a lens
b. Principal axis	ii. Line joining the centre of curvatures of the two surfaces of a lens
c. Optical centre	iii. Centre of the sphere of which the lens forms a part
d. Aperture	iv. Central point of a lens

• A. a - ii, b - iii, c - i, d - iv
• B. a - iii, b - ii, c - iv, d - i
• C. a - iv, b - ii, c - i, d - iii
• D. a - i, b - iii, c - ii, d - iv

Answer 1

The correct option is B a - iii, b - ii, c - iv, d - i

• Centre of curvature: Centre of the sphere of which the lens forms a part
• Principal axis: Line joining the centre of curvatures of the two surfaces of a lens
• Optical centre: Central point of a lens
• Aperture: Effective diameter of the circular outline of a lens