Hint:When a concave lens and a convex lens of the same focal length are in contact, then the power of the lens combination will be zero and its focal length will be infinite. Therefore, the combination behaves as a plane glass plate. Formula used: The effective ...
A. Convex lens B. Concave lens C. Plane mirror D. Prism 相关知识点: 试题来源: 解析 B。解析:近视是由于眼睛的晶状体对光线的会聚能力太强,需要用凹透镜来矫正。选项 A 凸透镜用于矫正远视眼;选项 C 平面镜主要用于反射;选项 D 棱镜用于光的色散等。反馈...
As for the features of a concave lens, which is true ( )A.It is thicker at the centreB.An object held close to it appears magnified.C.When it is moved, the objects seen through it move in the opposite direction.D.An object seen through it appears minifie
A. Suitable concave lens can be worn for correction B. Most of them are caused by excessive length of anterior and posterior diameter of the eyeball C. Near point is farther than emmetropia D. Far point is closer than the eye E. It can be corrected with cylindrical mirror ...
n. A lens having one surface convex and the opposite surface concave, with the concave surface having the greater curvature.
Focal length of concave mirror is _ always positive always negative zero A statue that is 2.3 cm tall is placed 15 cm in front of a convex mirror. The magnitude of the focal length of the mirror is 9 cm. Which of the following statements is true? Explain why each is true ...
the positive lens unit (U1) consists of a biconvex positive lens (121) stuck to a concave-convex negative lens (122), the negative lens unit (U2) consists of a biconcave negative lens (125) which has aspherical refraction surfaces, and the group (130) consists of a biconvex lens (131...
Mirror mirrors two mirrors and surfaces, surface mirror, concave mirror, convex mirrr; car rearview mirror as plane mirrors, body side rear-view mirror is typical of Conver lens. 翻译结果4复制译文编辑译文朗读译文返回顶部 A plane MIRROR mirror Mirror and curved surfaces, curved surface mirrors, ...
of a concave object would be a bowl or plate." Yet later, you name another convex item: the contact lens. "Soft contact lenses are shaped into a convex configuration," but a contact lens appears to be the shape of a bowl (to me, that is). Can you clarify more about the ...
A mirror diverges light.Refers to the distance from the focus to the center of the lens, which can be divided into: A. If the light on the concave lens is refracted and diverges in four directions, the focal lengths on both sides of the concave lens are equal, and it becomes the opti...