Light - Study Mode

[#111] When a person enters into a dark room from the strong light area, he is not able to see clearly for some time. Later he gradually begins to see things. This is because
Correct Answer

(D) Eyes become familiar with darkness in course of time

[#112] The point at which all the rays meet is called . . . . . . . .
Correct Answer

(D) focus

[#113] For a ray of light to suffer total internal reflection, it has to pass from
Correct Answer

(C) air to water

[#114] A person is unable to read a newspaper without his glasses. He is most probably suffering from
Correct Answer

(B) presbyopia

[#115] What is the principal focus of a spherical mirror?
Correct Answer

(B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection on appear to be arising from this point on the principal axis