Lenses and Mirrors

Question 1

Virtual image

Answer 1

upright, -Di, +m

Question 2

Real image

Answer 2

inverted, +Di, -m

Question 3

Concave mirror

Answer 3

converging

Question 4

Convex mirror

Answer 4

diverging

Question 5

Concave lens

Answer 5

diverging

Question 6

Convex lens

Answer 6

converging

Question 7

Convex/converging lenses correct:

Answer 7

farsightedness

Question 8

Farsightedness

Answer 8

hyperopia = can see far can’t see close because the focus of the lens is behind the retina (f > retina)

Question 9

Concave/diverging lenses correct:

Answer 9

nearsightedness

Question 10

Nearsightedness

Answer 10

myopia = can see close can’t see far because the focus of the lens is in front of the retina (f < retina)

Question 11

Lenses are the _____ of mirrors

Answer 11

OPPOSITE

Question 12

Concave/converging mirrors form ___ images

Answer 12

• If Do > f: real, inverted, larger, on same side as object (+Di, |-m| > 1)
• If Do < f: virtual, upright, behind mirror (-Di, |+m|)

Question 13

Convex/diverging mirrors form ___ images

Answer 13

Virtual (behind mirror), upright, smaller (-Di, |+m| < 1)

Question 14

Plane mirrors form ___ images

Answer 14

Virtual (behind mirror), upright, same size

Question 15

The focal length of concave/converging mirrors is

Answer 15

+ (same side as object)

Question 16

The focal length of convex/diverging mirrors is

Answer 16

• (opposite side/behind mirror)

Question 17

The focal length of plane mirrors is

Answer 17

infinite

Question 18

Concave/diverging lenses form ____ images

Answer 18

Virtual (same side as object), upright, smaller (-Di, |+m|<1)

Question 19

Convex/converging lenses form ____ images

Answer 19

• If Do > f: real (eye side), inverted (+Di, -m) *most

- If Do < f: virtual (object side), upright (-Do, +m)

Question 20

The focal length of concave/diverging lenses is

Answer 20

• (object side)

Question 21

The focal length of convex/converging lenses is

Answer 21

+ (eye side)

Question 22

Equation for magnification/height of images for mirrors and lenses

Answer 22

M = Hi / Ho = -Di / Do

*multiply for multiple lenses (glasses + eye)

Question 23

Lenses in glasses always form ___ images

Answer 23

virtual (-Di), upright (+m)

Question 24

Eye lens is

Answer 24

convex/converging (+f, +Di, -m, real, inverted)