The derivation of the double slit interference pattern requires use of the small angle approximation.

What is true about the small angle approximation?

a$.cos()=1$

b$.,sin()=cos()$

c$.tan()=1$

d$.sin()=1$

e$.sin()=tan()$

f$.\frac{y}{L}=mL$

$5.$ A laser beam in air is incident on a liquid at an angle of $37$ degrees with respect to the normal. The laser beam's angle in the liquid is $26$ degrees. What is the liquid's index of refraction?

$6.$ An object is $20$ cm in front of a diverging lens with a focal length of $10$ cm $.$ Determine the distance to the image in cm $.($Don$\text{'}$t forget $\frac{+}{?}-.)$

$q,$

cm

$7.$ An object is $20$ cm in front of a diverging lens with a focal length of $10$ cm $.$ What is the magnification of the image? $($Don$\text{'}$t forget $\frac{+}{-}.)$

$8.$ An object is $20$ cm in front of a diverging lens with a focal length of $10$ cm $.$ Is the image real or virtual?

a$.$ Virtual

b$.$ Real

$9.$ As measured in Earth's rest frame, a spaceship traveling at $0\mathrm{.}964$ c takes $11\mathrm{.}2$ y to travel between planets. How long does the trip take as measured by someone on the spaceship?

a$.2\mathrm{.}98$ y

b$.30\mathrm{.}7$ y

c$.7\mathrm{.}28$ y

d$.42\mathrm{.}1$ y