Question

3. Two mirrors PQ and RS are kept parallel to each other, a ray AB is incident on PQ
at B and gets reflected along BC, point C is on RS and back reflected along CD.
Prove that AB is parallel to CD.​

Answer 1

Answer:

here's your answer....

Step-by-step explanation:

ANSWER

From laws of refection ∠1=∠2and∠3=∠4          (IMAGE)

So, ∠1=∠2=21∠ABCand∠3=∠4=21∠BCD

Here BM and CN are Normal

So BM⊥PQandCN⊥RS

put,PQ∥RS

So, BM∥CN

Now BM∥CN, and BC is transversal

⇒∠2=∠3

⇒21∠ABC=21∠DCB

⇒∠ABC=∠BCD

AB∥CD as it transversal  BC

Intersect two lines such that pair of interior angle is equal then lines are parallel.