You need to build a alexandrite laser running at its 720 nm line in tem00 the laser has a resonator length of 0.804m and mirror radii of r7.341 m and r2- 3.347 m (a) is the cavity stable? (1 mark) (b) in order to use the laser in an optical system you need to locate the waist within the cavity and its spotsize. (3 marks) (c) you also must determine the spot size and divergence angle at the output for the laser. (3 marks)

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2