问题 问答题

如图所示,在“探究光的反射规律”实验中,E、F是两块粘起来的硬纸板,可绕垂直于平面镜M的接缝ON转动.

(1)如图甲,当E、F在同一平面上时,让入射光线AO沿纸板E射向镜面,在纸板F上可看到反射光线OB,通过测量发现∠BON______∠AON,若将AO向ON靠近,则OB靠近ON.如果让光线沿纸板F逆着BO方向射向镜面,在纸板E上可以看到反射光线沿______方向射出,这一现象表明______.

(2)如图乙,以ON为轴线,把纸板F向前或向后转折,不能在纸板F上看到反射光线,说明反射光线与入射光线及法线ON在______(同一/不同)平面内.

答案

(1)根据光的反射定律:在反射现象中,反射角等于入射角;反射光线、入射光线分居法线两侧;反射光线、入射光线和法线在同一平面内.

此时∠BON=∠AON.如果让光线沿纸板F逆着BO方向射向镜面,在纸板E上可以看到反射光线沿OA方向射出,说明光反射时,光路是可逆的;

(2)根据光的反射定律:在反射现象中,反射光线、入射光线分居法线两侧;反射光线、入射光线和法线在同一平面内.

所以把纸板F向前或向后折叠,则在纸板F上都不能看到反射光线,说明反射光线、与入射光线和法线应在同一平面内.

故答案为:(1)等于;OA;光反射时,光路是可逆的;(2)同一.

阅读理解

ENJOY YOUR FAVORITES IN STAR CINEMA
September
Fri-Sun
Voldemort:14:00; 16:00
Lord of the Rings(Ⅱ)The Two Towers:14:00; 16:00; 20:00; 22:00
Mon-Thurs
The Lion King, Shrek(Ⅱ):12:00; 14:00; 16:00; 20:00
October
Fri-Sun
Goblet of Fire:14:00; 16:00
Lord of the Rjngs(Ⅲ)The Return of the King:14:00; 16:00; 20:00; 22:00
Mon-Thurs
Lord of the Rings(Ⅱ)The Two Towers:12:00; 14:00; 16:00; 20:00
Voldemort:12:00; 14:00; 16:00
Tickets must be booked被预定 any time up to 30 minutes before the film starts. Ticket holders are given seat numbers.
Drinks are provided. Food may be bought from the shop and eaten in the area provided outside the cinema.
Ticket price: Adults: $16; Children under 6:$6; students under 16:$10
Smoking is not allowed anywhere in the cinema. Mobile phones must be kept off.
小题1:What film can you see on a Saturday night in October?
A.Lord of the Rings(Ⅲ)The Return of the King..
B.Lord of the Rings(Ⅱ)The Two Towers.
C.The Lion King, Shrek(Ⅱ).
D.Voldemort.
小题2:When can you see the film Voldemort?
A.Tuesday, October, 4 p.m.
B.Tuesday, October, 10 p.m.
C.Thursday, September, 8 p.m.
D.Friday, September, 4 a.m.
小题3:How much will it cost for a family with two children(one is 5 years old and the other is 8)to see a film?
A.$ 22.B.$ 30.C.$ 44.D.$ 48.
小题4:When can people book tickets?
A.The day before the film.
B.Anytime before the film.
C.An hour before the film.
D.No later than half an hour before the film.
小题5:What can you do in the cinema?
A.Eat some food.B.Have some drinks.
C.Make a phone call.D.Smoke in the area provided.
问答题 简答题