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Question 5., , What is the angle of incidence of a ray if the reflected ray is at an angle of 90°, to the incident ray ? [NCERT], , Answer:, , The angle of incidence = 45°., , Question 6., , What are the two factors responsible for an object to be seen ?, Answer:, , To be seen an object, the sense of vision and light are required., , Question 7., , What is meant by normal ?, , Answer:, , The perpendicular drawn at the point of incidence is known as normal, , Question 8., , Define the angle of incidence., , Answer:, , The angle between the incident ray and the normal is known as angle of, incidence., , Question 9., , What name is given to the angle between the normal and the reflected ray ?, Answer:, , Angle of reflection, , Question 10, , What is meant by lateral inversion ? [NCT2010}, , Answer:, , Lateral inversion is the phenomenon of the interchange of the left and right, sides, between the object and its image.