Physics 2

Question 1

Converging lenses

Answer 1

Light rays converge after refraction through the lens

Question 2

Characteristics of converging lenses

Answer 2

Lens is thickest in the middle and thinnest at the ends

Question 3

Diverging lenses

Answer 3

Light rays diverge after refraction from the lens

Question 4

Characteristics of diverging lenses

Answer 4

Thinnest in the middle and thickest at the edge

Question 5

Optical centre

Answer 5

The point at the exact centre of the lens

Question 6

Principal focus

Answer 6

The point on the principal axis of a lens where the light rays parallel to said axis converge after refraction (principal focus on the same side of the lens as the incident rays is called the secondary principal focus/F’)

Question 7

Difference between curved mirrors and lenses

Answer 7

• In mirrors, light reflects, but in lenses, light refracts
• Images on the same side of the mirror are real but on the same side of the lens are virtual
• Images on the other side of the mirror are virtual but on the other side of the lens are real