CH8 Light and Optics

Question 1

Electromagnetic spectrum range

remember visible spectrum

Answer 1

Question 2

Concave mirrors and convex lenses

what is the focal point and C formulas

• Further away from the C?
• On the C
• Between C and focal point?
• On the focal point
• Past the focus point?

Answer 2

All real images and inverted, except when past the focal point,

The focal point is where all rays flection meet at (f = r (radius of curvature) / 2). C is twice the distance of the F to the vertex of the mirror. C = 2f

• Further away from the C: The further away the smaller than the original (always inverted)
• On the C: Same size image (inverted)
• Between C and Focal point: Bigger than original
• On the focal point: No image parallel rays do not converge
• Past the focal point: Bigger than original and virtual

Question 3

• Speed of light from frequency and wavelength
• Index of refraction equation
• Snell’s law of refraction
• Critical angle equation

Answer 3

• c = f x lambda
• n = c / v
• n1sin@ = n2sin@
• @ = sin -1 (n2/n1)

Question 4

Convex mirrors (divergents) and concave lenses

Answer 4

thing of the actual mirror. they only create virtual, upright, and reduced imaged regardless of position

the further away the smaller the image will be

Question 5

Thin lens formula

Answer 5

1 / f = 1 / O + 1 / I

I = if + it is a real, therefore, inverted

f = if negative = convex

M(magnitude)= - (d_i/d_o) tells us the ratio of object to image

i.e object 8cm M=1/4 threfore image = 2cm (+ answer = not inverted)

Question 6

Farsighted and nearsighted

Answer 6

• Farsighted Hyperopia: can’t see near, light focuses behind the retina
• Nearsighted Myopia: can’t see far, light focuses in front of the retina not on it
  *

Question 7

Lens strenght

Answer 7