■解答
① \(2x\tan\theta\) ② \(\left(m+\displaystyle\frac{1}{2}\right)\lambda\) ③ \(\displaystyle\frac{\lambda}{2\tan\theta}\)
④ イ ⑤ \(2x\tan\theta=m\lambda\) ⑥ \(n\cos\alpha\)
⑦ \(\cos\alpha>\displaystyle\frac{1}{n}\) ⑧ \(d-\displaystyle\frac{x}{\tan\alpha}\) ⑨ \(-x\tan(\alpha +\beta)\)
⑩ ア
