Lenses Refract Light

Question 1

Convex lens:

Answer 1

A lens that is thicker at its centre and thinner at its edges. It collects parallel light rays to its focus.

Question 2

Concave lens:

Answer 2

A lens that is thicker at its edges and thinner at its centre. It spreads parallel light rays in different directions and directs their extensions to its virtual focus.

Question 3

Short-sighted:

Answer 3

A person who suffers from myopia, which is a condition where the lens of the eye refracts light too strongly. This makes seeing distant objects difficult. The condition can be fixed by wearing concave lenses.

Question 4

Far-sighted:

Answer 4

A person who suffers from hyperopia, which is a condition where the lens of the eye refracts light too weakly. This makes seeing nearby objects difficult. The condition can be fixed by wearing convex lenses.

Question 5

Polarised lens:

Answer 5

A type of lens that has a structure that reduces the number of reflections.

Question 6

Refractive power:

Answer 6

The power of a lens to refract light. Measured with a dioptre value.

Question 7

slides

Answer 7

50