?
II0?10a2?421214?10a4?14 bsin??2?2?yf'?7. 解
???????fb'2???btg???b
?y??2????y?1?2??fb'????71?4800?10?6002??0.4??2?0.18?mm??0.018?cm?y?2?2??fb'????72?4800?10?6002??0.4??6?0.06?mm? 8. 解：
?0.006?cm?
?次最大值公式：sin?sin?
20??2.46??3.477?1?b??5?2b7?2b
?b230?
?2b??5?2b
16
?
??157??257?6000?4286A
??或：??12.463.47k?6000?4254A?9. 解： （1）
sin??k'1?b
y?tg??ftg??sin?11??y?k?bf'y?tg??f?sin??f?1?''111?bf'?5461?101?7?100?0.05461?cm?
?0.055?cm??sin?10
??1.43'?b??3?2b
（2）
y?tg??f,tg??sin??y10?1.43?bf'?1.43?5461?101?7?100?0.078?cmor:?32?
???b?f'325461?101?7?100
?0.082?cm? 17
? （3）
sin??kk?b,k?3,y?k?bf'
10. 解： 即：?
?y3?tg??f'?sin??f'33?3??bf?3?5461?10?71?100
?0.164?cm?
?sin??k?k（1）
b
y?tg??f'tg??sin?
y2?y1??tg?2?tg?1??f'??sin?2?sin?1??f'???2???1?????f'?bb???'bf??b2?0.885f'??y2?y1??0.300?5.9?10?4?mm??5900?A?7y'?y'?y'?'?21?）bf'?1?100.2?3002
?4
?1.5?10?cm?
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（ 11. 解：
?N?3,光栅常数缝宽为b,相邻缝间不透明d'
的距离a?d?3b?a?b?4b?最小值有 N?1?3?1?2个次最大有 N?２?3?２?１个缺级级次为 j?kdb'?4k??4,?8,?12,?AN0又?A?j?jd????sin?j???bb??22d''II?j?1.6j2A2j0?A0N2?2?4????sin??j?????j?4??sin????j?4??
?IIIIIIIIIIIIIIII61?0.80?0.40?0.09?0?0.03
020304050?0.04?0.02?0仅画出正值）
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07080其大致图形如上所示（
?12. 解：
dsin??j?
?sin???sin??11j?dj?111???d??N???50?1?7600?10?0.038?7d???2.18sin??222j?d2?50?2?4000?10?0.04?7??2.292????????1??2.29?2.18?0.11?6.7?7
''?
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