plz answer this this is very urgent
Answers
Answer:
41) (c) 50°
42) (b) 40°
43) (b) No
44) (a) angle 1, angle 3
45) (a) angle 2, angle 4
Step-by-step explanation:
41) Always remember this Law: "Angle of incidence is equal to angle of reflection". By this, if angle 1 is 50°, ultimately angle 2, the angle of reflection, will be 50°.
42) Pay attention to Triangle PAB, angle PAB is 50°, and from point P, both the normals are being drawn. Hence, angle P is 90°. Use the Sum of all Angles Property:
angle PAB + angle PBA + angle APB = 180°
=> angle 3 = angle PBA = 40°
Your angle of incidence (angle 3) is 40°. Hence angle 4, the angle of reflection, will be also 40° by the Law of Reflection that I mentioned earlier.
43) The reason the given statement is false because the incident ray in angle 1 is being reflected by an angle of 50°, and the reflected ray in angle 4 is being produced by an angle of 40°. So, there is a slight difference in the positioning of both the rays, and hence are not parallel.
44) angle 1 and angle 3, because the incident ray is the ray that hits the mirrored surface to produce reflection.
45) angle 2 and angle 4, because the reflected rays are produced after the incident ray hits the mirrored surface to produce reflection.
Hope it helps.
Answer:
41) c) 50°
42) b) 40°
43) a) Yes
44) a) ∠ 1, ∠3
45) b) ∠ 2, ∠4
Step-by-step explanation:
41) In reflection, ∠I = ∠R
42) Angle sum property / Parallel lines cut by a transversal, ∠ABO = 40, ∠3 = 90 - 40 (∠ABO) = 50, ∠3 = ∠4 (reflection)
43) ∠CAB= 100, ∠ABD=80, ∠CAB + ∠DAB (interior angles) = 180, so they are parallel lines