Lenses and Light Worksheet

Which of the following is a function of lenses in everyday life?

• They are used to cook food.

• They are used to refract light in devices like glasses and cameras.

• They are used to generate electricity.

• They are used to store water.

What is the effect of light passing through a prism?

• Light always bends toward the thinnest part of the prism.

• Light always bends toward the thickest part of the prism.

• Light passes straight through without bending.

• Light is absorbed by the prism.

What is the centre of curvature of a lens?

• The point where all light rays meet

• The centre of the circle that produces the curved surface of a lens

• The midpoint of the lens thickness

• The point where the lens is thinnest

What is the focal length of a lens?

• The distance between the two faces of the lens

• The distance between the centre of a lens and its principal focus

• The thickness of the lens at its centre

• The distance from the lens to the object

If rays of light parallel to the principal axis are incident on a concave lens, what do the rays appear to do when traced back?

• Appear to come from a point on the same side of the lens as the light originates

• Appear to converge at the centre of curvature

• Appear to pass straight through the lens

• Appear to be absorbed by the lens

Why are three rays commonly used to simplify the drawing of ray diagrams?

• To make the diagram look more complex

• To determine the position and nature of the image accurately

• To show the color spectrum

• To measure the thickness of the lens

When the object is between F and the lens in a convex lens, what is the nature and orientation of the image?

• Real, inverted, and smaller

• Virtual, upright, and larger

• Real, upright, and smaller

• Virtual, inverted, and larger

According to the text, which term is NOT used to describe an image larger than the object?

• Magnified

• Enlarged

• Diminished

• Bigger

When an object is placed at a distance from a concave lens, what are the characteristics of the image produced?

• Real, inverted, and larger.

• Virtual, upright, and smaller.

• Real, upright, and the same size.

• Virtual, inverted, and larger.

What is the first step in determining the nature, location, orientation, and size of an image formed by a lens using a ray diagram?

• Measure the thickness of the lens

• Sketch the principal axis and mark the focal points

• Calculate the refractive index

• Find the wavelength of light used