(1)小明用发出平行光的手电筒正对凸透镜照射,移动光屏到图甲位置时,光屏上出现了最小最亮的光斑,这说明凸透镜对光有
(2)实验中出现如图乙所示的实像,他判断此像是实像的依据应是
(3)在(2)的基础上,保持蜡烛、光屏不动,向右缓慢移动凸透镜直到光屏上又出现烛焰的像,此时成像的情况是
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2