Optics

Question 1

Magnification formula

Answer 1

M = Hi/Ho = - Di / Do

Question 2

Illuminance formula

Answer 2

Horizontal:
Eh = I / r^2 * cos * α
Vertical:
Ev = I / r^2 * cos (90-α)

Where I is illuminous intensity in cd r is distance α is the angle from light source to lit object

Question 3

Focal length of a curved mirror

Answer 3

f = r/2

Question 4

Thin lenses formula

Answer 4

1/f = 1/Do + 1/Di