Mirrors/Lenses

Question 1

Diverging devices and sign convention of focal length

Answer 1

Convex mirror/concave lens (-f)

Question 2

Sign conventions: Real

Answer 2

-hi

+di

Question 3

Sign conventions: Virtual

Answer 3

+hi

-di

Question 4

Convex mirror is always ____

Answer 4

Virtual

Question 5

di in lens mirror equation
do in lens mirror equation
f in lens mirror equation

Answer 5

di=distance of image to Lens/mirror
do=distance of object to lens/mirror
f=focal length

Question 6

Inverted image=

Erect image=

Answer 6

Inverted=Real

Erect=Virtual

Question 7

At focus=

Answer 7

At focus=no image

Question 8

Converging–

Virtual—-

Answer 8

Converging–closer to device

Virtual–longer image

Question 9

Equation for focal point

Answer 9

f=C/2
where,
f=focal point
C=centre of curvature

Question 10

Convex mirror/concave lens both have what?

Answer 10

Virtual focal point

Question 11

Concave mirror/convex lens both have what?

Answer 11

Real focal point

Question 12

Converging devices and sign convention of focal length

Answer 12

Concave mirror/convex lens (+f)