Ch 18: Ray Optics

Question 1

A diverging lens always has a negative _____ ______.

Answer 1

focal length

Question 2

A lens is a transparent object that uses refraction of light rays at curved surfaces to form an image.
A converging lens will cause the rays to refract ______ the optical axis.

Answer 2

toward

Question 3

18.3

When a ray is transmitted into a material with a HIGHER index of refraction (such as from air into water), it bends to make a ______ angle with the normal.

When transmitted into a material with a LOWER index of refraction, it bends to make a ______ angle with the normal.

Answer 3

smaller

larger

p. 628

Question 4

What is the formula for calculating the critical angle of incidence for total internal reflection?

Answer 4

θ_c = sin^-1 (n²/n¹⁾