7.Answer the following questions.
a.What are spherical mirrors?
b. Define lateral inversion.
C. What does the point of incidence mean?
d. What do you mean by focus?
e. State the laws of refraction?
Answers
Answer:
a] A mirror with a surface that is either concave or convex and forms a portion of a true sphere.
b] The type of reversal that occurs with an image formed by a plane mirror. Since, however, that is (correctly) to the observer's left, the real reversal is of front and back; the image is 'turned through' itself to face the object – hence the alternative name.
c] Point of incidence: The point on the surface where the incident ray strikes the surface is called the point of incidence. Reflected ray: The ray of light that bounces back from the surface of an object is called a reflected ray of light.
d] 1 : to cause to be concentrated focused their attention on the most urgent problems. 2a : to adjust the focus of (the eye, a lens, etc.) focus the telescope. b : to bring into focus The results of that research were focused for classroom presentation. 3 : to bring (something, such as light rays) to a focus.
e] The principle that for a ray, radar pulse, or the like, that is incident on the interface of two media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocity of the ray in the first medium to the velocity in the second medium and the incident ray.
(a) A spherical mirror with a surface that is either concave or convex and from a portion of a true sphere is called spherical mirror.
(b) Lateral inversion is a phenomenon in which left appears to be right and vice versa . it is due to direction that light follows when it strikes a reflection surface generally a mirror.
(d) The need to prevent a nuclear war become the focus of all diplomatic efforts. physics at point which rays at light, heat or other radiation meet after being refracted or reflected.(e) the the angle of reflection is equals to angle of incidence.both angle are measured with respect to the normal to the mirror.