The active element of a certain laser?

Question

The active element of a certain laser is an ordinary glass rod 16 cm long and 0.7 cm in diameter. If the temperature of the rod increases by 77°C.
(a) Find its increase in length.
________cm
(b) Find its increase in diameter.
________cm
(c) Find its increase in volume.
________cm3

Answer 1

You need to know the thermal index of expansion of the glass. There are many kinds of "ordinary glass".