2.11 Lenses & Formation of Images

In this photograph, the water droplet is acting like a lens. Lenses work because of _________.

• reflection

• refraction

• diffraction

• interference

The lens pictured is exhibiting _______ behavior and is ______ in shape.

• converging, convex

• converging, concave

• diverging, convex

• diverging, concave

The lens pictured is exhibiting _______ behavior and is ______ in shape.

• converging, convex

• converging, concave

• diverging, convex

• diverging, concave

Which best describes the optical centre of this lens?

• 2F

• F

• The midpoint of F & F

• The top of the lens

Which best describes the axis of symmetry of the lens?

• 2F

• F

• The horizontal line through the middle of the lens

• A vertical line through the middle of the lens

Which best describes the principal axis?

• F

• 2F

• The horizontal line going through the centre of the lens

• A vertical line going through the centre of the lens

Which best describes the principal focus of this lens?

• F

• 2F

• Top of the lens

• Bottom of the lens

Why is the focal point important for lenses?

• The focal point controls where the object is.

• The focal point is where light rays converge or diverge, affecting image formation and clarity.

• The focal point is where light originates from.

• The focal point determines the color of the light.

Which best describes the focal length?

• The distance from O to F

• The distance from F to F'

• The distance from the top of the lense to the bottom of the lens

• The distance from the object to the lens