Topic 5 - Light And The Electromagnetic Spectrum - Concave Lenses

Question 1

What is the shape of concave lenses?

Answer 1

Caves inward

This refers to the physical structure of concave lenses, which are thinner at the center than at the edges.

Question 2

What is the effect of the principal ray in a concave lens?

Answer 2

Spreads light outwards

The principal ray indicates that light appears to come from the focal point after passing through the lens.

Question 3

What is the focal ray in relation to a concave lens?

Answer 3

Draw horizontal ray from top of object

This ray helps determine how light behaves as it passes through the lens.

Question 4

What happens to the central ray when it hits a concave lens?

Answer 4

Exits along the same direction as the faint line

The faint line is drawn from the focal point to the point where the ray hits the lens.

Question 5

Where is the image located when using a concave lens?

Answer 5

Same side, inside f

The ‘f’ represents the focal point, indicating that the image appears on the same side as the object.

Question 6

What type of image is formed by a concave lens?

Answer 6

Virtual, upright, and reduced in size

This type of image cannot be projected on a screen because it is not real.

Question 7

What is a practical application of concave lenses?

Answer 7

Used to correct short-sightedness

Concave lenses help focus light correctly onto the retina for individuals who have difficulty seeing distant objects.

Question 8

Fill in the blank: Concave lenses are used to _______ light.

Answer 8

spread out

This spreading of light is essential for correcting vision issues.